s=input()
ma=0
now=0
i=0
while i<len(s):
	if s[i]=="y":
		if i+8>=len(s):
			break
		if s[i:i+9]=="yukicoder":
			now+=1
			i+=8
	else:
		ma=max(ma,now)
		now=0
	i+=1
ma=max(ma,now)
print(ma)