#!/usr/bin/env python3
import sys
sys.setrecursionlimit(10 ** 9)

def main():
    N, M = map(int, input().split())
    S = input()
    pdca = "PDCA"
    ans = 0
    G = [[] for _ in range(N)]
    A = [pdca.index(ss) for ss in S]
    sum = [0] * N

    for _ in range(M):
        u, v = map(lambda i : int(i) - 1, input().split())
        G[u].append(v)
        G[v].append(u)
    
    # print(A)
    for i in range(N):
        if A[i] == 2:
            t = 0
            for next in G[i]:
                if A[next] == 3:
                    t += 1
            sum[i] += t
    # print(sum)
    for i in range(N):
        if A[i] == 1:
            t = 0
            for next in G[i]:
                if A[next] == 2:
                    t += sum[next]
            sum[i] += t         
    # print(sum)
    for i in range(N):
        if A[i] == 0:
            t = 0
            for next in G[i]:
                if A[next] == 1:
                    t += sum[next]
            ans += t     
    print(ans % 1000000007)
    return

if __name__ == '__main__':
    main()