func main()
	var s: []char :: cui@input()
	var c: int :: -1
	var w: int :: 0
	for i(0, ^s - 1)
		switch(s[i])
		case 'c'
			do c :+ 1
		case 'w'
			do w :+ 1
		end switch
	end for
	var ans: int :: [c, w].min()
	do cui@print("\{ans}\n")
end func