from collections import defaultdict

n, m = map(int, input().split())
s = input()
G = defaultdict(list)
for _ in range(m):
    u, v = map(int, input().split())
    u -= 1
    v -= 1
    if s[u] == 'P' and s[v] == 'D':
        G[v].append(u)
    elif s[u] == 'D' and s[v] == 'P':
        G[u].append(v)
    elif s[u] == 'D' and s[v] == 'C':
        G[v].append(u)
    elif s[v] == 'D' and s[u] == 'C':
        G[u].append(v)
    elif s[u] == 'C' and s[v] == 'A':
        G[v].append(u)
    elif s[u] == 'A' and s[v] == 'C':
        G[u].append(v)
mod = 10**9 + 7

DP = [0 for _ in range(n)]
for ss in ['A', 'C', 'D']:
    for i in range(n):
        if s[i] == ss:
            if ss == 'A':
                DP[i] = 1
            for j in G[i]:
                DP[j] += DP[i]
                DP[j] %= mod
ans = 0
for i in range(n):
    if s[i] == 'P':
        ans += DP[i]
        ans %= mod
print(ans)