S = input()

l = []
now = 0
le = len(S)
while now < le:
    if S[now:now+9] == "yukicoder":
        l.append(1)
        now += 9
    else:
        l.append(0)
        now += 1

ans = 0
now = 0
for x in l:
    if x:
        now += 1
        ans = max(ans,now)
    else:
        now = 0
print(ans)