S = list(input())
YUKI = list('yukicoder')
ans = 0
temp = 0
y = 0
for s in S:
    if s==YUKI[y]:
        y+=1
        if y==len(YUKI):
            temp+=1
            y=0
    else:
        ans = max(temp,ans)
        temp=0
        y=0
print(max(temp,ans))