from collections import *
from itertools import *
from heapq import *
from functools import *
import sys,math
input = sys.stdin.readline

S = list(input())[:-1]
N = len(S)
X = list('yukicoder')
now = 0
ans = []
while now < N-8:
    if all(S[now+j]==X[j] for j in range(9)):
        ans.append('*')
        now += 9
    else:
        ans.append(S[now])
        now += 1

res = 0
for g,r in groupby(ans):
    if g=='*':
        res = max(res,len(list(r)))
print(res)