using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        var input = Console.ReadLine();
        var list = new List<int>();
        for (int i = 0; i < 3; i++)
        {
            list.Add(int.Parse(input[i].ToString()));
        }
        Console.WriteLine(list.Max() - list.Min());
    }
}