#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
const int mod = 1e9 + 7;
int n, m;
string s, t = "PDCA";
vector<int> g[100005];
int dfs(int cur, int depth) {
	if (s[cur] != t[depth]) return 0;
	else {
		if (depth == 3) return 1;
		int res = 0;
		for (int nbr : g[cur]) {
			res += dfs(nbr, depth + 1);
			res %= mod;
		}
		return res;
	}
}
signed main() {
	ios::sync_with_stdio(false); cin.tie(0);
	cin >> n >> m;
	cin >> s;
	for (int i = 0; i < m; i++) {
		int x, y;
		cin >> x >> y;
		x--; y--;
		g[x].push_back(y);
		g[y].push_back(x);
	}
	int ans = 0;
	for (int i = 0; i < n; i++) {
		if (s[i] == 'P') ans = ans + dfs(i, 0) % mod;
	}
	cout << ans << endl;
	return 0;	
}