#include <iostream>
#include <vector>
#include <string.h>
using namespace std;

string S;
vector<vector<int>> roads;

long dp[100010][3];

long move(int now, int PDCA){
    if(PDCA == 3){
        return 1;
    }else if(dp[now][PDCA] != -1){
        return dp[now][PDCA];
    }
    long ans = 0;
    for(int i: roads[now]){
        if(S[i] == "PDCA"[PDCA + 1]){
            ans += move(i, PDCA + 1);
        }
    }
    return dp[now][PDCA] = ans % long(1e9 + 7);
}

int main(){
    int N, M;
    cin >> N >> M >> S;
    roads.resize(N);
    for(int i = 0; i < M; i++){
        int u, v;
        cin >> u >> v;
        roads[u - 1].push_back(v - 1);
        roads[v - 1].push_back(u - 1);
    }
    memset(dp, -1, sizeof(dp));
    long ans = 0;
    for(int i = 0; i < N; i++){
        if(S[i] == 'P'){
            ans += move(i, 0);
        }
    }
    cout << ans % long(1e9 + 7) << endl; 
}