moji=input()
yuki='yukicoder'
l=len(yuki)
if moji.count(yuki) > 0:
    ans=l//9
else:
    ans=0

while l<10**6:
    yuki+=yuki
    l=len(yuki)
    if moji.count(yuki)>0:
        ans=l//9
print(ans)