N = int(input())
S = input()
mod = 10 ** 9 + 7


def make_table(S, T):
    N = len(S)
    M = len(T)
    dp = [[0] * (M + 1) for _ in range(N+1)]
    for i in range(N+1):
        dp[i][0] = 1

    for i in range(N):
        for j in range(M):
            dp[i+1][j+1] += dp[i][j+1]
            if S[i] == T[j]:
                dp[i+1][j+1] += dp[i][j]
                dp[i+1][j+1] %= mod
    return dp


F = make_table(S, "yukicoder")
G = make_table(S[::-1], "yukicoder"[::-1])[::-1]

ans = F[N][9]
for i, s in enumerate(S):
    if s == "?":
        for j in range(1, 8):
            ans += F[i][j] * G[i][8-j] % mod
            ans %= mod

print(ans)