s=input()
t='yukicoder'
n=len(t)
ans=0
c=0
i=0
while i+n<=len(s):
    if s[i:i+n]==t:
        c+=1
        i+=n
    else:
        ans=max(ans,c)
        c=0
        i+=1
ans=max(ans,c)
print(ans)