#include <bits/stdc++.h>
using namespace std;

template<const int MOD> struct prime_modint {
    using mint = prime_modint;
    unsigned int v;
    prime_modint() : v(0) {}
    prime_modint(int a) { a %= MOD; if(a < 0)a += MOD; v = a; }
    prime_modint(long long a) { a %= MOD; if(a < 0)a += MOD; v = a; }
    static constexpr int mod() { return MOD; }
    mint& operator++() {v++; if(v == MOD)v = 0; return *this;}
    mint& operator--() {if(v == 0)v = MOD; v--; return *this;}
    mint operator++(int) { mint result = *this; ++*this; return result; }
    mint operator--(int) { mint result = *this; --*this; return result; }
    mint& operator+=(const mint& rhs) { v += rhs.v; if(v >= MOD) v -= MOD; return *this; }
    mint& operator-=(const mint& rhs) { if(v < rhs.v) v += MOD; v -= rhs.v; return *this; }
    mint& operator*=(const mint& rhs) {
        v = (unsigned int)((unsigned long long)(v) * rhs.v % MOD);
        return *this;
    }
    mint& operator/=(const mint& rhs) { return *this = *this * rhs.inv(); }
    mint operator+() const { return *this; }
    mint operator-() const { return mint() - *this; }
    mint pow(long long n) const {
        assert(0 <= n);
        mint r = 1, x = *this;
        while (n) {
            if (n & 1) r *= x;
            x *= x;
            n >>= 1;
        }
        return r;
    }
    mint inv() const { assert(v); return pow(MOD - 2); }
    friend mint operator+(const mint& lhs, const mint& rhs) { return mint(lhs) += rhs; }
    friend mint operator-(const mint& lhs, const mint& rhs) { return mint(lhs) -= rhs; }
    friend mint operator*(const mint& lhs, const mint& rhs) { return mint(lhs) *= rhs; }
    friend mint operator/(const mint& lhs, const mint& rhs) { return mint(lhs) /= rhs; }
    friend bool operator==(const mint& lhs, const mint& rhs) { return (lhs.v == rhs.v); }
    friend bool operator!=(const mint& lhs, const mint& rhs) { return (lhs.v != rhs.v); }
    friend std::ostream& operator << (std::ostream &os, const mint& rhs) noexcept { return os << rhs.v; }
};
using mint = prime_modint<1000000007>;
//using mint2 = prime_modint<998244353>;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, m, u, v;
    string s, t = "PDCA";
    cin >> n >> m >> s;
    vector<vector<int>> g(n);
    for(int i = 0; i < m; i++){
        cin >> u >> v;
        g[--u].push_back(--v);
        g[v].push_back(u);
    }
    vector<mint> dp(n);
    for(int i = 0; i < n; i++) if(s[i] == t[0]) dp[i]++;
    for(int i = 0; i < 3; i++){
        vector<mint> ndp(n);
        for(int v = 0; v < n; v++){
            if(s[v] != t[i])continue;
            for(auto &&u:g[v]){
                if(s[u] != t[i + 1]) continue;
                ndp[u] += dp[v];
            }
        }
        swap(dp, ndp);
    }
    cout << accumulate(dp.begin(), dp.end(), mint(0)) << endl;
}