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

/* macro */
#define rep(i,a,b) for(int i=a;i<b;i++)
#define revrep(i,a,b) for(int i = a; i > b; i--)
#define int long long
#define exist(s,e) ((s).find(e)!=(s).end())
#define all(v) (v).begin(), (v).end()
#define each(s,itr) for(auto (itr) = s.begin(); (itr) != s.end(); (itr)++)
#define sum(v) accumulate(all(v), (0LL))
#define pb push_back


/* alias */
template<class T> using vec = vector<T>;
typedef vector<int> vi;
typedef pair<int, int> pi;


/* constant */
const int inf = 1000100010010010;
const int mod = 1e9 + 7;
int dx[8]={1,0,-1,0,-1,1,-1,1};
int dy[8]={0,1,0,-1,-1,-1,1,1};


/* io_method */
int input(){int tmp;cin >> tmp;return tmp;}
string raw_input(){string tmp;cin >> tmp;return tmp;}
string readline(){string s;getline(cin, s);return s;}
template<class T> void printx(T n){cout << n;}
template<class T, class U> void printx(pair<T, U> p){cout << "(" << p.first << "," << p.second << ")";}
template<class T> void printx(vector<T> v){cout << "{";rep(i,0,v.size()){printx(v[i]);if(i != v.size()-1)printx(",");}cout << "}";}
template<class T> void print(T n){printx(n);cout << endl;}
template<class T> void print(set<T> s){cout << "{";each(s, e){if(e != s.begin()) printx(",");printx(*e);}cout << "}" << endl;}
template<class T, class U> void print(map<T, U> mp){cout << "{";each(mp, e){cout << "(" << e -> first << "," << e -> second << ")";}cout << "}" << endl;}


/* general_method */
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
//template<class T>auto cut(T &a, int l, int r){return T(a.begin()+l, a.begin()+r);}

/* main */
int n, m;
vi arr;
vec<vi> edges(100010);

int dp[100010];

int dfs(int v){

    if(arr[v] == 3) return 1;

    if(dp[v] > -1) return dp[v];

    int ans = 0;
    rep(i,0,edges[v].size()){
        int nxt = edges[v][i];
        if(arr[nxt] == arr[v] + 1) ans += dfs(nxt);
        ans %= mod;
    }

    return dp[v] = (ans + mod) % mod;


}



signed main(){


    cin.tie(0);
    ios::sync_with_stdio(false);

    cin >> n >> m;
    string s = raw_input();

    rep(i,0,n){
        if(s[i] == 'P') arr.push_back(0);
        if(s[i] == 'D') arr.push_back(1);
        if(s[i] == 'C') arr.push_back(2);
        if(s[i] == 'A') arr.push_back(3);
    }


    rep(i,0,m){
        int f, t; cin >> f >> t; f--; t--;
        edges[f].push_back(t);
        edges[t].push_back(f);
    }

    memset(dp, -1, sizeof(dp));


    int ans = 0;
    rep(i,0,n){
        if(arr[i] == 0) ans += dfs(i);
        ans %= mod;
    }
    print((ans + mod) % mod);



 

    

    


    




    






    



    


    

}