#include <bits/stdc++.h>
#define all(vec) vec.begin(),vec.end()
using namespace std;
using ll=long long;
using P=pair<int,int>;
const ll INF=1LL<<30;
const ll LINF=1LL<<61;
const double eps=1e-9;
const ll MOD=1e9+7;
int main(){
    int n,m;cin>>n>>m;
    vector<vector<int>> G(n);
    string s;cin>>s;
    vector<ll> p(n),a(n);
    for(int i=0;i<m;i++){
        int u,v;cin>>u>>v;--u;--v;
        G[u].push_back(v);
        G[v].push_back(u);
        if(s[u]=='P')p[v]++;
        if(s[u]=='A')a[v]++;
        if(s[v]=='P')p[u]++;
        if(s[v]=='A')a[u]++;
    }    
    ll ans=0;
    for(int i=0;i<n;i++){
        for(auto e:G[i]){
            if(s[i]=='D'&&s[e]=='C'){
                ans+=p[i]*a[e]%MOD;
                ans%=MOD;
            }
        }
    }
    cout<<ans<<endl;
}