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#include<bits/stdc++.h>
using namespace std;
 
typedef long long int      ll;
 
#define sc                 scanf
#define pf                 printf
#define sci(n)             scanf("%d",&n)
#define scl(n)             scanf("%lld",&n)
#define scii(n,m)          scanf("%d %d",&n,&m)
#define pfi(n)             printf("%d",n)
#define pfl(n)             printf("%lld",n)
#define line               printf("\n")
#define spc                printf(" ")
#define loop(i,x,y)        for(int i=int(x); i<=int(y); i++)
#define rloop(i,y,x)       for(int i=int(y); i>=int(x); i--)
#define clr(a,x)           memset(a,x,sizeof(a))
#define pb                 push_back
#define mpp                make_pair
#define ff                 first
#define ss                 second
#define all(v)             v.begin(),v.end()
#define rall(v)            v.rbegin(),v.rend()
#define read()             freopen("input.txt", "r", stdin)
#define write()            freopen("output.txt", "w", stdout)
#define fastIO()           ios_base::sync_with_stdio(false); cin.tie(NULL);
/// Constants
#define eps                1e-9
#define PI                 acos(-1.0)  // 3.1415926535897932
#define MAX                100000009
 
 
int main()
{
    //read();
    //write();
    int n,m;
    cin>>n>>m;
    map< char, set< pair<int, char> > > mp;
    map<char, int> val;
    char s, d;
    cin>>s>>d;
    for(int i=1;i<=m;i++){
        char u,v;
        int x;
        cin>>u>>v>>x;
        mp[u].insert(mpp(x,v));
        mp[v].insert(mpp(x,u));
        val[u]=MAX;
        val[v]=MAX;
    }
    set< pair<int, char> > qu;
    qu.insert(mpp(0,s));
    while(qu.size()){
        set< pair<int, char> >::iterator it,itt;
        it = qu.begin();
        int vl = it.ff;
        char u = it.ss;
        qu.erase(it);
        itt = mp[u].begin();
        for(;itt!=mp[u].end();itt++){
            if(vl+itt.ff<=val[itt.ss]){
                val[itt.ss]=vl+itt.ff;
                qu.insert(mpp(val[itt.ss],itt.ss));
            }
        }
    }
    cout<<val[v]<<endl;
    return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:20:28: error: ‘std::set<std::pair<int, char> >::iterator’ {aka ‘struct std::_Rb_tree_const_iterator<std::pair<int, char> >’} has no member named ‘first’
 #define ff                 first
                            ^~~~~
prog.cpp:57:21: note: in expansion of macro ‘ff’
         int vl = it.ff;
                     ^~
prog.cpp:21:28: error: ‘std::set<std::pair<int, char> >::iterator’ {aka ‘struct std::_Rb_tree_const_iterator<std::pair<int, char> >’} has no member named ‘second’
 #define ss                 second
                            ^~~~~~
prog.cpp:58:21: note: in expansion of macro ‘ss’
         char u = it.ss;
                     ^~
prog.cpp:20:28: error: ‘std::set<std::pair<int, char> >::iterator’ {aka ‘struct std::_Rb_tree_const_iterator<std::pair<int, char> >’} has no member named ‘first’
 #define ff                 first
                            ^~~~~
prog.cpp:62:23: note: in expansion of macro ‘ff’
             if(vl+itt.ff<=val[itt.ss]){
                       ^~
prog.cpp:21:28: error: ‘std::set<std::pair<int, char> >::iterator’ {aka ‘struct std::_Rb_tree_const_iterator<std::pair<int, char> >’} has no member named ‘second’
 #define ss                 second
                            ^~~~~~
prog.cpp:62:35: note: in expansion of macro ‘ss’
             if(vl+itt.ff<=val[itt.ss]){
                                   ^~
prog.cpp:21:28: error: ‘std::set<std::pair<int, char> >::iterator’ {aka ‘struct std::_Rb_tree_const_iterator<std::pair<int, char> >’} has no member named ‘second’
 #define ss                 second
                            ^~~~~~
prog.cpp:63:25: note: in expansion of macro ‘ss’
                 val[itt.ss]=vl+itt.ff;
                         ^~
prog.cpp:20:28: error: ‘std::set<std::pair<int, char> >::iterator’ {aka ‘struct std::_Rb_tree_const_iterator<std::pair<int, char> >’} has no member named ‘first’
 #define ff                 first
                            ^~~~~
prog.cpp:63:36: note: in expansion of macro ‘ff’
                 val[itt.ss]=vl+itt.ff;
                                    ^~
prog.cpp:21:28: error: ‘std::set<std::pair<int, char> >::iterator’ {aka ‘struct std::_Rb_tree_const_iterator<std::pair<int, char> >’} has no member named ‘second’
 #define ss                 second
                            ^~~~~~
prog.cpp:64:39: note: in expansion of macro ‘ss’
                 qu.insert(mpp(val[itt.ss],itt.ss));
                                       ^~
prog.cpp:21:28: error: ‘std::set<std::pair<int, char> >::iterator’ {aka ‘struct std::_Rb_tree_const_iterator<std::pair<int, char> >’} has no member named ‘second’
 #define ss                 second
                            ^~~~~~
prog.cpp:64:47: note: in expansion of macro ‘ss’
                 qu.insert(mpp(val[itt.ss],itt.ss));
                                               ^~
prog.cpp:68:15: error: ‘v’ was not declared in this scope
     cout<<val[v]<<endl;
               ^

Standard output is empty