import java.io.*;
import java.util.*;

public class Main {
    static final int MOD = 1000000007;
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int m = sc.nextInt();
        char[] types = sc.next().toCharArray();
        ArrayList<ArrayList<Integer>> graph = new ArrayList<>();
        for (int i = 0; i < n; i++) {
            graph.add(new ArrayList<>());
        }
        long[] pcounts = new long[n];
        long[] acounts = new long[n];
        for (int i = 0; i < m; i++) {
            int a = sc.nextInt() - 1;
            int b = sc.nextInt() - 1;
            if (types[a] == 'D') {
                if (types[b] == 'P') {
                    pcounts[a]++;
                } else if (types[b] == 'C') {
                    graph.get(a).add(b);
                }
            } else if (types[a] == 'C') {
                if (types[b] == 'A') {
                    acounts[a]++;
                } else if (types[b] == 'D') {
                    graph.get(b).add(a);
                }
            } else if (types[a] == 'P') {
                if (types[b] == 'D') {
                    pcounts[b]++;
                }
            } else if (types[a] == 'A') {
                if (types[b] == 'C') {
                    acounts[b]++;
                }
            }
        }
        long ans = 0;
        for (int i = 0; i < n; i++) {
            for (int x : graph.get(i)) {
                ans += pcounts[i] * acounts[x];
                ans %= MOD;
            }
        }
        System.out.println(ans);
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}