n = int(input())
s = str(input())

d = {'y':0, 'u':1, 'k':2, 'i':3, 'c':4, 'o':5, 'd':6, 'e':7, 'r':8}
mod = 10**9+7

dp = [[0, 0] for i in range(9)]
for c in s:
    if c in d:
        j = d[c]
        if j == 0:
            dp[0][0] += 1
        else:
            dp[j][0] += dp[j-1][0]
            dp[j][0] += mod
            dp[j][1] += dp[j-1][1]
            dp[j][1] += mod
    elif c == '?':
        dp[0][1] += 1
        for j in reversed(range(1, 9)):
            dp[j][1] += dp[j-1][0]
            dp[j][1] += mod
ans = dp[8][0]+dp[8][1]
print(ans%mod)