import sys
n = int(input())
if n<9:
    print(0)
    sys.exit()
s = input()
p = 10**9+7
ans = 0
keys = []
key = list("yukicoder")
keys.append({'y': 0, 'u': 1, 'k': 2, 'i': 3, 'c': 4, 'o': 5, 'd': 6, 'e': 7, 'r': 8})
for k in range(9):
    di = {}
    for kk in range(9):
        if k==kk:
            di["?"]=kk
        else:
            di[key[kk]]=kk
    keys.append(di)
    #print(di)

for di in keys:
    dp = [[0]*(n+1) for _ in range(9)]
    for i in range(n):
        if s[i] in di:
            ind = di[s[i]]
        else:
            ind = 9
        for j in range(9):
            if j==ind:
                if j==0:
                    dp[j][i+1]=(dp[j][i]+1)%p
                else:
                    dp[j][i+1]=(dp[j][i]+dp[j-1][i])%p
            else:
                dp[j][i+1]=(dp[j][i])%p
    ans+=dp[8][n]%p
    #print(ans)
print(ans%p)