#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<(n);++i)
using ll=long long;
template<class T>using V=vector<T>;
constexpr ll mod = 1000000007;
int main() {
	int n,m;cin>>n>>m;
	string s;cin>>s;
	V<ll> d(n),c(n);
	V<pair<int,int>> edge(m);
	for(auto& [a,b]:edge){
		cin>>a>>b;
		--a,--b;
		if(s[a]=='P' and s[b]=='D')++d[b];
		if(s[a]=='D' and s[b]=='P')++d[a];
		if(s[a]=='C' and s[b]=='A')++c[a];
		if(s[a]=='A' and s[b]=='C')++c[b];
	}
	ll ans=0;
	for(auto [a,b]:edge)ans=(ans+d[a]*c[b]+d[b]*c[a])%mod;
	cout<<ans<<"\n";
	
	return 0;
}