import sys
#sys.setrecursionlimit(10 ** 6)
INF = float('inf')
#10**20,2**63に変えるのもあり
MOD = 10**9 + 7
MOD2 = 998244353
from collections import defaultdict
def ceil(A,B):
    return -(-A//B)
def solve():
    def II(): return int(sys.stdin.readline())
    def LI(): return list(map(int, sys.stdin.readline().split()))
    def LC(): return list(input())
    def IC(): return [int(c) for c in input()]
    def MI(): return map(int, sys.stdin.readline().split())
    S = input()
    N = len(S)
    yuki = "yukicoder"
    Y = [False]*N
    for i in range(N-8):
        if(S[i:i+9]==yuki):
            Y[i]=True
    Ans = 0
    #print(Y)
    for s in range(9):
        tmp=0
        for i in range(s,N-8,9):
            if(Y[i]):
                tmp+=1
            else:
                tmp=0
            Ans = max(Ans,tmp)
    print(Ans)

    return
solve()