#include<algorithm>
#include<cmath>
#include<cstdio>
#include<functional>
#include<iomanip>
#include<iostream>
#include<map>
#include<queue>
#include<set>
#include<string>
#include<utility>
#include<vector>

using namespace std;
typedef long long ll;
const ll mod = 1000000007;
#define rep(i,n) for(int i=0;i<n;i++)
#define repl(i,s,e) for(int i=s;i<e;i++)
#define reple(i,s,e) for(int i=s;i<=e;i++)
#define revrep(i,n) for(int i=n-1;i>=0;i--)
#define all(x) (x).begin(),(x).end()

int main()
{	
	int N, M;
	cin >> N >> M;

	string s;
	cin >> s;

	map<char, char> next
	{
	  {'P', 'D'}
	, {'D', 'C'}
	, { 'C', 'A'}
	, { 'A', 'X'}
	};
	

	vector<vector<int>> edges(N, vector<int>());

	rep(i, M)
	{
		int u, v;
		cin >> u >> v;

		--u;
		--v;

		if (next[s[u]] == s[v]) edges[u].push_back(v);
		if (next[s[v]] == s[u]) edges[v].push_back(u);
	}

	ll count = 0;
	rep(i, N)
	{
		if (s[i] != 'P') continue;

		for (auto d : edges[i])
		{
			for (auto c : edges[d])
			{
				count += edges[c].size();
				count %= mod;
			}
		}
	}

	cout << count << endl;

	return 0;
}