MOD = 10**9 + 7
import sys
sys.setrecursionlimit(10**7)
next = {'P':'D','D':'C','C':'A','A':'P'}
def dfs(v,path):
    path += S[v]
    if path == 'PDCA':
        return 1
    res = 0
    for i in graph[v]:
        if S[i] == next[S[v]]:
            res += dfs(i,path)
    return res
N, M = map(int, input().split())
S = input()
graph = [[] for _ in range(N)]
for _ in range(M):
    u, v = map(int, input().split())
    graph[u-1].append(v-1)
    graph[v-1].append(u-1)
ans = 0
for i in range(N):
    if S[i] == 'P':
        ans += dfs(i,'')
        ans %= MOD
print(ans)