import sys
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
INF = 2**63-1
mod = 998244353

s = input()

y = "yukicoder"
t = y
now = 0


for i in range(len(s)):
    if t in s:
        now += 1
        t += y
    else:
        break
print(now)