import sys
import io, os
sys.setrecursionlimit(10**9)
input = sys.stdin.readline

n, m = map(int, input().split())
s = str(input().rstrip())
g = [[] for i in range(n)]
mod = 10**9+7
for i in range(m):
    u, v = map(int, input().split())
    u, v = u-1, v-1
    g[u].append(v)
    g[v].append(u)

memo = {}
def dfs(v, A):
    if len(A) == 4:
        return 1
    if v in memo:
        return v
    ret = 0
    for u in g[v]:
        if A[-1] == 'P':
            if s[u] == 'D':
                ret += dfs(u, A+[s[u]])
        elif A[-1] == 'D':
            if s[u] == 'C':
                ret += dfs(u, A+[s[u]])
        elif A[-1] == 'C':
            if s[u] == 'A':
                ret += dfs(u, A+[s[u]])
    return ret
ans = 0
for v in range(n):
    if s[v] == 'P':
        ans += dfs(v, ['P'])
        ans %= mod
print(ans%mod)