from collections import defaultdict

n = int(input())
S = list(input())

yukicoder = defaultdict(int)
yukicoder_str = "yukicoder"
for i in range(9):
    yukicoder[yukicoder_str[i]] = i

dp = [[0 for _ in range(10)] for _ in range(n + 1)]
dp[0][0] = 1
mod = 10**9 + 7
for i in range(n):
    for j in range(10):
        dp[i + 1][j] = dp[i][j]
    if S[i] in yukicoder_str:
        dp[i + 1][yukicoder[S[i]] + 1] += dp[i][yukicoder[S[i]]]
        dp[i + 1][yukicoder[S[i]] + 1] %= mod
    elif S[i] == '?':
        for j in range(9):
            dp[i + 1][j + 1] += dp[i][j]
            dp[i + 1][j + 1] %= mod
print(dp[-1][-1])