s = input()
idx = 0
num = 0
su = 0
fd = 0
while 1:
    try:
        ik = s.index("yukicoder", idx + 1)
        fd = 1
        if ik - idx == 9:
            num += 1
            su = max(su, num)

        else:
            num = 0
        idx = ik
    except:
        break
if fd:
    print(su + 1)
else:
    print(0)