#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (n);i++)
#define sz(x) int(x.size())
typedef long long ll;
typedef pair<int,int> P;

const int mod = 1e9+7;
int dp[100010];
int main(){
  int n, m;
  cin >> n >> m;
  string s;
  cin >> s;
  vector<P> pd, dc, ca;
  rep(i,m) {
    int u, v;
    cin >> u >> v;
    u--; v--; 
    if (s[u] < s[v]) swap(u,v);
    if (s[u] == 'P' && s[v] == 'D') pd.push_back({u,v}), dp[u] = 1;
    if (s[u] == 'D' && s[v] == 'C') dc.push_back({u,v});
    if (s[u] == 'C' && s[v] == 'A') ca.push_back({u,v});
  }   
  for (auto e : pd) {
    (dp[e.second] += dp[e.first]) %= mod;
  }
  for (auto e : dc) {
    (dp[e.second] += dp[e.first]) %= mod;
  }
  int res = 0;

  for (auto e : ca) {
    (res += dp[e.first]) %= mod;
  }

  cout << res << endl;

  return 0;
}