S = input()

U = "yukicoder"
l = []
i = 0
while i < len(S):
	if S[i] == "y":
		j = 0
		while i + j < len(S) and S[i + j] == U[j]:
			j += 1
			if j == len(U):
				l.append(i)
				break
		i += j
	else:
		i += 1
ans = 0
now = 0
for i in range(1,len(l)):
	if l[i] - l[i-1] == len(U):
		if now == 0:
			now = 2
		else:
			now += 1
	else:
		if now > ans:
			ans = now
		now = 0
if now > ans:ans = now
print(ans)