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

int main() {
    int n,m;
    cin>>n>>m;
    string s;cin>>s;
    vector<int> g[n];
    ll dp[n]{};
    for (int i=0;i<m;i++) {
        int v,u;cin>>v>>u;
        v--,u--;
        if (s[v]=='P') dp[v]=1;
        if (s[u]=='P') dp[u]=1;
        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<3;i++)
        for (int j=0;j<n;j++)
            if (s[j]==pdca[i])
                for (int u:g[j])
                    if (s[u]==pdca[i+1]) {
                        if (i==2) ans=(ans+dp[j])%mod;
                        else dp[u]=(dp[u]+dp[j])%mod;
                    }
    cout<<ans<<endl;
    return 0;
}