#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define fbo find_by_order
#define ook order_of_key
typedef long long ll;
typedef pair<int,int> ii;
typedef vector<int> vi;
typedef long double ld;
typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> pbds;
typedef set<int>::iterator sit;
typedef map<int,int>::iterator mit;
typedef vector<int>::iterator vit;
const int N = 100001;
const int MOD = 1e9 + 7;
vi adj[N];
bool color[N];
int visited[N];
bool hascolor[N];
bool dfscolor[N];
ll ans = 1;
bool dfs(int u, bool col, int mx)
{
//cerr<<u<<' '<<col<<' '<<visited[u]<<' '<<mx<<'\n';
visited[u]++; dfscolor[u] = col;
bool ans = true;
if(hascolor[u]&&color[u] != col) ans = false;
for(int i = 0; i < adj[u].size(); i++)
{
int v = adj[u][i];
if(visited[v] == mx)
{
if(dfscolor[v] != (col^1))
{
ans = false;
}
continue;
}
bool tmp = dfs(v, (col^1), mx);
ans&=tmp;
}
return ans;
}
int main()
{
ios_base::sync_with_stdio(0); cin.tie(0);
int n, m;
cin >> n >> m;
for(int i = 0; i < m; i++)
{
int u, v; cin>>u>>v; u--; v--;
adj[u].pb(v); adj[v].pb(u);
}
string s; cin>>s;
for(int i = 0; i < n; i++)
{
hascolor[i] = 1;
if(s[i] == 'W') color[i] = 1;
else if(s[i] == 'B') color[i] = 0;
else hascolor[i] = 0;
}
for(int i = 0; i < n; i++)
{
if(visited[i] == 0)
{
int cnt = 0;
if(dfs(i, 0, 1)) cnt++;
if(dfs(i, 1, 2)) cnt++;
ans = (ans*cnt)%MOD;
}
}
cout << ans << '\n';
}
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