#include "bits/stdc++.h"

using namespace std;

using ll = long long;
using ld = long double;

const double PI = 3.1415926535897932384626433832795;

const int dx[] = { 0, 1, 0, -1 };
const int dy[] = { -1, 0, 1, 0 };

int gcd(int x, int y) { return y ? gcd(y, x % y) : abs(x); }
ll gcd(ll x, ll y) { return y ? gcd(y, x % y) : abs(x); }
int lcm(int x, int y) { return x / gcd(x, y) * y; }
ll lcm(ll x, ll y) { return x / gcd(x, y) * y; }

const ll MOD = 1e9 + 7;

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

	ll n, m;
	string s;
	cin >> n >> m >> s;

	vector<ll> pMoveCnt(n), aMoveCnt(n);
	vector<pair<int, int>> dc;
	for (int i = 0; i < m; i++) {
		int u, v;
		cin >> u >> v;
		u--; v--;

		pMoveCnt[u] += s[v] == 'P';
		pMoveCnt[v] += s[u] == 'P';
		aMoveCnt[u] += s[v] == 'A';
		aMoveCnt[v] += s[u] == 'A';

		for (int j = 0; j < 2; j++) {
			if (s[u] == 'D' && s[v] == 'C') {
				dc.emplace_back(u, v);
			}
			swap(u, v);
		}
	}

	ll ans = 0;
	for (auto e : dc) {
		int dIndex = e.first;
		int aIndex = e.second;

		ans += pMoveCnt[dIndex] * aMoveCnt[aIndex];
		ans %= MOD;
	}
	cout << ans << endl;
	return 0;
}