import java.util.Arrays;
import java.util.Scanner;

public class Slash_1883 {
    public static void log(Object obj) {
        System.out.println(obj.toString());
    }
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        int[] a = new int[3];
        for(int i=0;i<3;i++) {
            a[i] = Integer.parseInt(String.valueOf(s.charAt(i)));
        }
        Arrays.sort(a);
        log(a[2]-a[0]);
    }
}