func main()
	{ 数値の標準入力(x) }
	var x: int :: cui@inputInt()
	var a: int :: x / 100
	var b: int :: (x - a * 100) / 10
	var c: int :: x % 10
	
	var M: int :: lib@max(a,
	|lib@max(b, c))
	var m: int :: lib@min(a,
	|lib@min(b, c))
	
	do cui@print("\{M - m}")
end func