#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
signed main() {
	ios::sync_with_stdio(false); cin.tie(0);
	const int mod = 1e9 + 7;
	int n, m;
	cin >> n >> m;
	string s;
	cin >> s;
	vector<pair<int, int>> e[3];
	vector<int> dp(n);
	for (int i = 0; i < m; i++) {
		int u, v;
		cin >> u >> v;
		u--; v--;
		if (s[u] < s[v]) swap(u, v);
		if (s[u] == 'P' && s[v] == 'D') {
			e[0].emplace_back(u, v);
			dp[u] = 1;
		}
		if (s[u] == 'D' && s[v] == 'C') {
			e[1].emplace_back(u, v);
		} 
		if (s[u] == 'C' && s[v] == 'A') {
			e[2].emplace_back(u, v);
		}
	}
	for (int i = 0; i < 3; i++) {
		for (auto j : e[i]) {
			dp[j.second] += dp[j.first];
			dp[j.second] %= mod;
		}
	}
	int ans = 0;
	for (int i = 0; i < n; i++) {
		if (s[i] == 'A') {
			ans += dp[i];
			ans %= mod;
		}
	}
	cout << ans << endl;
	return 0;	
}