from collections import defaultdict


def main():
    mod = 10 ** 9 + 7
    n, m = map(int, input().split())
    s = input()

    adj = defaultdict(list)
    for _ in range(m):
        a, b = map(int, input().split())
        a -= 1
        b -= 1
        if s[a] + s[b] in ["PD", "DC", "CA"]:
            adj[a].append(b)
        if s[b] + s[a] in ["PD", "DC", "CA"]:
            adj[b].append(a)

    wd = "PDCA"
    # dp[i][v]:PDCAのi文字目まで来ていて，終点が頂点vの経路数
    dp = [[0 for _ in range(n)] for _ in range(4)]

    # 1文字目
    for i in range(n):
        if s[i] == wd[0]:
            dp[0][i] = 1

    # 2文字目以降
    for i in range(1, len(wd)):
        for u in range(n):
            for v in adj[u]:
                if s[v] == wd[i]:
                    dp[i][v] += dp[i - 1][u]
                    dp[i][v] %= mod

    res = sum(dp[3]) % mod
    print(res)


if __name__ == "__main__":
    main()