#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<sstream>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<climits>
#include<cmath>
#include<string>
#include<vector>
#include<set>
#include<map>
#include<queue>
#include<numeric>
#include<functional>
#include<algorithm>
#include<bitset>
#include<tuple>
#include<unordered_set>
#include<unordered_map>
#include<random>
#include<array>
#include<cassert>
using namespace std;
#define INF (1<<29)
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define all(v) v.begin(),v.end()
#define uniq(v) v.erase(unique(all(v)),v.end())

#define MOD 1000000007

string s;
int n, m;
vector<int> edge[100000];
int dp[100000];


int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);

	cin >> n >> m;
	cin >> s;
	rep(i,m) {
		int u, v;
		cin >> u >> v;
		u--; v--;
		if (s[u] == 'P' && s[v] == 'D' || s[u] == 'D' && s[v] == 'C' || s[u] == 'C' && s[v] == 'A') {
			edge[u].push_back(v);
		}
		if (s[v] == 'P' && s[u] == 'D' || s[v] == 'D' && s[u] == 'C' || s[v] == 'C' && s[u] == 'A') {
			edge[v].push_back(u);
		}
	}

	rep(i, n)if (s[i] == 'P')dp[i] = 1;
	rep(c,3) {
		rep(i, n)if("PDCA"[c] ==s[i] && dp[i]){
			for (int u : edge[i]) {
				dp[u] += dp[i];
				dp[u] %= MOD;
			}
		}
	}
	int ans = 0;
	rep(i,n)if(s[i]=='A') {
		ans += dp[i];
		ans %= MOD;
	}
	cout << ans << endl;


	return 0;
}