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

constexpr long long mod = 1e9+7;
int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    int N, M;
    cin >> N >> M;
    string S;
    cin >> S;
    vector<vector<int>> Es(N, vector<int>());
    for (int i = 0; i < M; ++i){
        int u, v;
        cin >> u >> v;
        --u;
        --v;
        if (S[u] == 'P'){
            if (S[v] == 'D'){
                Es[u].push_back(v);
            }
        }else if (S[u] == 'D'){
            if (S[v] == 'P'){
                Es[v].push_back(u);
            }else if (S[v] == 'C'){
                Es[u].push_back(v);
            }
        }else if (S[u] == 'C'){
            if (S[v] == 'D'){
                Es[v].push_back(u);
            }else if (S[v] == 'A'){
                Es[u].push_back(v);
            }
        }else if (S[u] == 'A'){
            if (S[v] == 'C'){
                Es[v].push_back(u);
            }
        }
    }
    long long ans = 0;
    for (int p = 0; p < N; ++p){
        for (int d: Es[p]){
            for (int c: Es[d]){
                (ans += Es[c].size()) %= mod;
            }
        }
    }
    cout << ans << endl;
    return 0;
}