import sys
input = sys.stdin.readline

S=input().strip()
x="yukicoder"

ANS=0

ind=0
now=0
while ind<len(S):
    if S[ind:ind+9]==x:
        now+=1
        ind+=9
    else:
        now=0
        ind+=1
    ANS=max(ANS,now)

print(ANS)