#include"bits/stdc++.h"

using namespace std;
using ll = long long;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

#define FOR(k,m,n) for(ll (k)=(m);(k)<(n);(k)++)
#define REP(i,n) FOR((i),0,(n))
#define WAITING(str) int str;std::cin>>str;
#define DEBUGING(str) cout<< #str << " " str<<endl

constexpr int INF = (1 << 30);
constexpr ll INFL = (1ll << 60);
constexpr ll MOD = 1000000007;// 10^9+7



int main()
{
	int N, M;
	string S;
	cin >> N >> M >> S;
	vector<ll> score(N);
	vector<vector<int>> edges(N);
	REP(i, M) {
		int a, b;
		cin >> a >> b;
		a--; b--;
		edges[a].push_back(b);
		edges[b].push_back(a);
	}

	ll res = 0;
	REP(from, N)if (S[from] == 'C')for (auto to : edges[from])if (S[to] == 'A')score[from]++;
	REP(from, N)if (S[from] == 'D')for (auto to : edges[from])if (S[to] == 'C')score[from] = (score[from] + score[to]) % MOD;
	REP(from, N)if (S[from] == 'P')for (auto to : edges[from])if (S[to] == 'D')res = (res + score[to]) % MOD;
	cout << res << endl;

	return 0;
}