func main()
	var s: []char :: cui@input()
	const yukicoder: []char :: "yukicoder"
	
	var ans: int :: 0
	var i: int :: 0
	while(i < ^s)
		var cnt: int :: 0
		var idx: int :: 0
		while loop(i < ^s & s[i] = yukicoder[idx])
			do idx :+ 1
			do idx :% 9
			if(idx = 0)
				do cnt :+ 1
			end if
			do i :+ 1
		end while
		if(cnt > ans)
			do ans :: cnt
		end if
		do i :+ 1
	end while
	do cui@print("\{ans}\n")
end func