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

ll mod=1e9+7;
vector<vector<int>> v(111111);
string s;
int n,m;
string pdca="PDCA";
vector<ll> cnt(111111,1);

ll calc(int a,int p){
    ll ret=0;
    for(auto i:v[p]){
        if(s[i]==pdca[a+1]){
            ret+=cnt[i];
            ret%=mod;
        }
    }

    return ret;
}

signed main(){
    ios::sync_with_stdio(false);
	cin.tie(0);

    cin>>n>>m;
    cin>>s;
    for(int i=0;i<m;i++){
        int a,b;
        cin>>a>>b;
        a--,b--;
        v[a].push_back(b);
        v[b].push_back(a);
    }
    ll ans=0;
    for(int i=2;i>=0;i--){
        for(int j=0;j<n;j++){
            if(pdca[i]==s[j]){
                cnt[j]=calc(i,j);
                if(i==0) ans+=cnt[j];
                ans%=mod;
            }
        }
    }
    cout<<ans<<endl;

}