def Run_Length(lst):
    run_length=[]
    if lst:
        prev=lst[0]
        cnt=1
        for x in lst[1:]:
            if x==prev:
                cnt+=1
            else:
                run_length.append((prev,cnt))
                prev=x
                cnt=1
        run_length.append((prev,cnt))
    return run_length

S=input()
S=S.replace("yukicoder","#")
ans=0
for s,c in Run_Length(S):
    if s=="#":
        ans=max(ans,c)
print(ans)