#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int dfs(vector<int> g[], int v, string s, string pdca, int i, int mod) {
    ll ans=0;
    for (int u:g[v]) {
        if (s[u]==pdca[i]) {
            if (i==3) ans+=1;
            else ans=(ans+dfs(g,u,s,pdca,i+1,mod))%mod;
        }
    }
    return ans;
}

int main() {
    int n,m;
    cin>>n>>m;
    string s;cin>>s;
    vector<int> g[n];
    for (int i=0;i<m;i++) {
        int v,u;cin>>v>>u;
        v--,u--;
        g[v].push_back(u);
        g[u].push_back(v);
    }
    string pdca="PDCA";
    ll ans=0;
    int mod=1e9+7;
    for (int i=0;i<n;i++) {
        if (s[i]==pdca[0]) {
            ans=(ans+dfs(g,i,s,pdca,1,mod))%mod;
        }
    }
    cout<<ans<<endl;
    return 0;
}