import sys
input = sys.stdin.readline

N, M = map(int, input().split())
S = input()
adj_list = [[] for _ in range(N)]

for _ in range(M):
    ui, vi = map(int, input().split())
    adj_list[ui-1].append(vi-1)
    adj_list[vi-1].append(ui-1)

cnt = [0]*N

for v in range(N):
    if S[v] in ['P', 'A']:
        continue
    
    if S[v]=='D':
        for nv in adj_list[v]:
            if S[nv]=='P':
                cnt[v] += 1
    elif S[v]=='C':
        for nv in adj_list[v]:
            if S[nv]=='A':
                cnt[v] += 1

ans = 0
MOD = 10**9+7

for v in range(N):
    if S[v]=='D':
        for nv in adj_list[v]:
            if S[nv]=='C':
                ans += cnt[v]*cnt[nv]
                ans %= MOD

print(ans)