n = int(input())
s = input()
d = {"y":1,"u":2,"k":3,"i":4,"c":5,"o":6,"d":7,"e":8,"r":9,"?":-1}
p = 10**9+7

dp1 = [[0 for i in range(10)] for j in range(n+1)]
dp2 = [[0 for i in range(10)] for j in range(n+1)]
dp1[0][0] = 1
for i in range(n):
    for j in range(10):
        dp1[i+1][j] = dp1[i][j]
        dp2[i+1][j] = dp2[i][j]
    if s[i] == "?":
        for j in range(1,10):
            dp2[i+1][j] = (dp2[i+1][j] + dp1[i][j-1]) % p
    elif s[i] in d:
        ind = d[s[i]]
        dp1[i+1][ind] = (dp1[i+1][ind] + dp1[i][ind-1]) % p
        dp2[i+1][ind] = (dp2[i+1][ind] + dp2[i][ind-1]) % p

ans = (dp1[n][9] + dp2[n][9]) % p
print("{}".format(ans))