using System;

public class Hello
{
    static void Main()
    {
        var s = Console.ReadLine().Trim();
        var a = new int[3];
        for (int i = 0; i < 3; i++) a[i] = s[i] - '0';
        Array.Sort(a);
        Console.WriteLine(a[2] - a[0]);
    }
}