#include <vector>
#include <iostream>
#define M 1000000007
using namespace std;
int main(int argc, char** argv) {
    int n, m;
    string s;
    cin >> n >> m >> s;
    vector<int> adj[100100];

    for (int i = 0; i < m; i++) {
        int x, y; cin >> x >> y;
        adj[x].push_back(y); adj[y].push_back(x);
    }
    long long dp[4][100100] = {};
    const string target = "ACDP";
    for (int j = 1; j <= n; j++) if (s[j-1] == 'A') dp[0][j] = 1;
    for (int i = 1; i < 4; i++)
        for (int j = 1; j <= n; j++) {
            if (s[j-1] == target[i])
                for (int k : adj[j]) dp[i][j] += dp[i-1][k];
            dp[i][j] %= M;
        }
    long long ans = 0;
    for (int j = 1; j <= n; j++) ans += dp[3][j];
    cout << ans % M << endl;
}