import java.util.*;

public class Main {
    static final int MOD = 1000000007;
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int m = sc.nextInt();
        char[] arr = sc.next().toCharArray();
        long[] counts = new long[n];
        ArrayList<Integer>[] lists = new ArrayList[n];
        for (int i = 0; i < n; i++) {
            if (arr[i] == 'D') {
                lists[i] = new ArrayList<Integer>();
            }
        }
        for (int i = 0; i < m; i++) {
            int a = sc.nextInt() - 1;
            int b = sc.nextInt() - 1;
            if (arr[a] == 'P') {
                if (arr[b] == 'D') {
                    counts[b]++;
                }
            } else if (arr[a] == 'D') {
                if (arr[b] == 'P') {
                    counts[a]++;
                } else if (arr[b] == 'C') {
                    lists[a].add(b);
                }
            } else if (arr[a] == 'C') {
                if (arr[b] == 'D') {
                    lists[b].add(a);
                } else if (arr[b] == 'A') {
                    counts[a]++;
                }
            } else if (arr[a] == 'A') {
                if (arr[b] == 'C') {
                    counts[b]++;
                }
            }
        }
        long total = 0;
        for (int i = 0; i < n; i++) {
            if (arr[i] != 'D') {
                continue;
            }
            for (int x : lists[i]) {
                total += counts[i] * counts[x];
                total %= MOD;
            }
        }
        System.out.println(total);
    }
}