# import pypyjit;pypyjit.set_param("max_unroll_recursion=-1")
# from bisect import *
# from collections import *
# from heapq import *
# from itertools import *
# from math import *
# from datetime import *
# from decimal import*
# from string import ascii_lowercase,ascii_uppercase
# import numpy as np
import sys
import os

# sys.setrecursionlimit(10**6)
INF = 10**18
MOD = 998244353
# MOD = 10**9 + 7
File = open("input.txt", "r") if os.path.exists("input.txt") else sys.stdin


def input():
    return File.readline()[:-1]


# ///////////////////////////////////////////////////////////////////////////


S = input()
S = S.replace("yukicoder", "0")


def count_max_char(s, c):
    """
    文字列sに含まれる文字cの最大連続数を返す関数
    s: 文字列
    c: 検索する文字
    """
    count = 0
    max_count = 0
    for i in range(len(s)):
        if s[i] == c:
            count += 1
        else:
            max_count = max(max_count, count)
            count = 0
    max_count = max(max_count, count)
    return max_count


cnt = count_max_char(S, "0")
print(cnt)