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#include <bits/stdc++.h>
 
#define ll long long
#define X first
#define Y second
#define MP make_pair
 
using namespace std;
 
const int N = 4e5, INF = 1e9 + 7, bl = 300;
 
int n, k, p[N], clr[N], was[N], ans[N], maxx;
vector<int> g[N], gr[N], topsort, cmp, gg[N];
 
void dfs(int v){
    was[v] = 1;
    for(int u: g[v]){
        if(!was[u])
            dfs(u);
    }
    topsort.push_back(v);
}
 
void rdfs(int v){
    was[v] = 1;
    for(int u: gr[v]){
        if(!was[u])
            rdfs(u);
    }
    cmp.push_back(v);
}
 
void vdfs(int v, int cc = 26){
    maxx = max(maxx, 26 - cc + 1);
    was[v] = 1, ans[v] = cc;
    for(int u: gg[v]){
        if(!was[u]){
            vdfs(u, max(cc - 1, 1));
        }
    }
}
 
int main () {
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
 
    cin >> n >> k;
    for(int i = 1;i <= n;i++){
        cin >> p[i];
        if(i != 1){
            g[p[i]].push_back(p[i - 1]);
            gr[p[i - 1]].push_back(p[i]);
        }
    }
    for(int i = 1;i <= n;i++){
        cin >> p[i];
        if(i != 1){
            g[p[i]].push_back(p[i - 1]);
            gr[p[i - 1]].push_back(p[i]);
        }
    }
    for(int i = 1;i <= n;i++){
        if(!was[i])
            dfs(i);
    }
    vector<int> tt;
 
    reverse(topsort.begin(), topsort.end());
    memset(was, 0, sizeof(was));
    for(int i = 0, j = 0;i < n;i++){
        int v = topsort[i];
        if(!was[v]){
            cmp.clear();
            rdfs(v);
            j += 1;
            for(int u: cmp){
                clr[u] = j;
            }
            tt.push_back(j);
        }
    }
    for(int i = 1;i <= n;i++){
        for(int u: g[i]){
            if(clr[i] != clr[u])
                gg[clr[i]].push_back(clr[u]);
        }
    }
    memset(was, 0, sizeof(was));
    for(int i = 0;i < tt.size();i++){
        int v = tt[i];
        if(!was[v]){
            vdfs(v);
        }
    }
 
    if(maxx < k)
        return cout << "NO", 0;
    cout << "YES\n";
 
    for(int i = 1;i <= n;i++){
        char c = ans[clr[i]] - 1 + 'a';
        cout << c;
    }
}

Main.java:1: error: illegal character: '#'
#include <bits/stdc++.h>
^
Main.java:1: error: class, interface, or enum expected
#include <bits/stdc++.h>
         ^
Main.java:2: error: illegal character: '\u00a0'
?
^
Main.java:3: error: illegal character: '#'
#define ll long long
^
Main.java:4: error: illegal character: '#'
#define X first
^
Main.java:5: error: illegal character: '#'
#define Y second
^
Main.java:6: error: illegal character: '#'
#define MP make_pair
^
Main.java:7: error: illegal character: '\u00a0'
?
^
Main.java:9: error: illegal character: '\u00a0'
?
^
Main.java:10: error: class, interface, or enum expected
const int N = 4e5, INF = 1e9 + 7, bl = 300;
      ^
Main.java:11: error: illegal character: '\u00a0'
?
^
Main.java:12: error: class, interface, or enum expected
int n, k, p[N], clr[N], was[N], ans[N], maxx;
    ^
Main.java:13: error: class, interface, or enum expected
vector<int> g[N], gr[N], topsort, cmp, gg[N];
^
Main.java:14: error: illegal character: '\u00a0'
?
^
Main.java:15: error: class, interface, or enum expected
void dfs(int v){
     ^
Main.java:17: error: class, interface, or enum expected
    for(int u: g[v]){
    ^
Main.java:20: error: class, interface, or enum expected
    }
    ^
Main.java:22: error: class, interface, or enum expected
}
^
Main.java:23: error: illegal character: '\u00a0'
?
^
Main.java:26: error: class, interface, or enum expected
    for(int u: gr[v]){
    ^
Main.java:29: error: class, interface, or enum expected
    }
    ^
Main.java:31: error: class, interface, or enum expected
}
^
Main.java:32: error: illegal character: '\u00a0'
?
^
Main.java:35: error: class, interface, or enum expected
    was[v] = 1, ans[v] = cc;
    ^
Main.java:36: error: class, interface, or enum expected
    for(int u: gg[v]){
    ^
Main.java:39: error: class, interface, or enum expected
        }
        ^
Main.java:42: error: illegal character: '\u00a0'
?
^
Main.java:45: error: class, interface, or enum expected
    cin.tie(0);
    ^
Main.java:46: error: class, interface, or enum expected
    cout.tie(0);
    ^
Main.java:48: error: class, interface, or enum expected
    cin >> n >> k;
    ^
Main.java:49: error: class, interface, or enum expected
    for(int i = 1;i <= n;i++){
    ^
Main.java:49: error: class, interface, or enum expected
    for(int i = 1;i <= n;i++){
                  ^
Main.java:49: error: class, interface, or enum expected
    for(int i = 1;i <= n;i++){
                         ^
Main.java:51: error: class, interface, or enum expected
        if(i != 1){
        ^
Main.java:53: error: class, interface, or enum expected
            gr[p[i - 1]].push_back(p[i]);
            ^
Main.java:54: error: class, interface, or enum expected
        }
        ^
Main.java:56: error: class, interface, or enum expected
    for(int i = 1;i <= n;i++){
                  ^
Main.java:56: error: class, interface, or enum expected
    for(int i = 1;i <= n;i++){
                         ^
Main.java:58: error: class, interface, or enum expected
        if(i != 1){
        ^
Main.java:60: error: class, interface, or enum expected
            gr[p[i - 1]].push_back(p[i]);
            ^
Main.java:61: error: class, interface, or enum expected
        }
        ^
Main.java:63: error: class, interface, or enum expected
    for(int i = 1;i <= n;i++){
                  ^
Main.java:63: error: class, interface, or enum expected
    for(int i = 1;i <= n;i++){
                         ^
Main.java:66: error: class, interface, or enum expected
    }
    ^
Main.java:69: error: class, interface, or enum expected
    reverse(topsort.begin(), topsort.end());
    ^
Main.java:70: error: class, interface, or enum expected
    memset(was, 0, sizeof(was));
    ^
Main.java:71: error: class, interface, or enum expected
    for(int i = 0, j = 0;i < n;i++){
    ^
Main.java:71: error: class, interface, or enum expected
    for(int i = 0, j = 0;i < n;i++){
                         ^
Main.java:71: error: class, interface, or enum expected
    for(int i = 0, j = 0;i < n;i++){
                               ^
Main.java:73: error: class, interface, or enum expected
        if(!was[v]){
        ^
Main.java:75: error: class, interface, or enum expected
            rdfs(v);
            ^
Main.java:76: error: class, interface, or enum expected
            j += 1;
            ^
Main.java:77: error: class, interface, or enum expected
            for(int u: cmp){
            ^
Main.java:79: error: class, interface, or enum expected
            }
            ^
Main.java:81: error: class, interface, or enum expected
        }
        ^
Main.java:83: error: class, interface, or enum expected
    for(int i = 1;i <= n;i++){
                  ^
Main.java:83: error: class, interface, or enum expected
    for(int i = 1;i <= n;i++){
                         ^
Main.java:87: error: class, interface, or enum expected
        }
        ^
Main.java:90: error: class, interface, or enum expected
    for(int i = 0;i < tt.size();i++){
    ^
Main.java:90: error: class, interface, or enum expected
    for(int i = 0;i < tt.size();i++){
                  ^
Main.java:90: error: class, interface, or enum expected
    for(int i = 0;i < tt.size();i++){
                                ^
Main.java:92: error: class, interface, or enum expected
        if(!was[v]){
        ^
Main.java:94: error: class, interface, or enum expected
        }
        ^
Main.java:99: error: class, interface, or enum expected
    cout << "YES\n";
    ^
Main.java:101: error: class, interface, or enum expected
    for(int i = 1;i <= n;i++){
    ^
Main.java:101: error: class, interface, or enum expected
    for(int i = 1;i <= n;i++){
                  ^
Main.java:101: error: class, interface, or enum expected
    for(int i = 1;i <= n;i++){
                         ^
Main.java:103: error: class, interface, or enum expected
        cout << c;
        ^
Main.java:104: error: class, interface, or enum expected
    }
    ^
69 errors

Standard output is empty