MOD = 10**9+7
N, M = map(int, input().split())
S = input()
G = [list(map(int, input().split())) for _ in range(M)]
edges = [[] for _ in range(N)]
check = ['PD','DC','CA']
for a, b in G:
    tmp1 = S[a-1]+S[b-1]
    tmp2 = S[b-1]+S[a-1]
    for i in check:
        if tmp1 == i:
            edges[a - 1].append(b - 1)
        if tmp2 == i:
            edges[b - 1].append(a - 1)
ans = 0
for i in range(N):
    if S[i]=="P":
        for j in edges[i]:
            for k in edges[j]:
                ans += len(edges[k])%MOD
print(ans%MOD)