S = input()
y = "yukicoder"
ans = 0
cnt = 0
i = 0
while i<len(S):
    flag = True
    for j in range(len(y)):
        if i>=len(S):
            flag = False
            break
        if y[j]!=S[i]:
            flag = False
            if j==0:
                i+=1
            break
        i+=1
    if flag:
        cnt += 1
        ans = max(ans, cnt)
    else:
        ans = max(ans, cnt)
        cnt = 0
print(ans)