import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int a = n % 10;
		int b = n / 10 % 10;
		int c = n / 100;
		int t;
		if(a > b){
			t = a;
			a = b;
			b = t;
		}if(b > c){
			t = b;
			b = c;
			c = t;
		}if(a > b){
			t = a;
			a = b;
			b = t;
		}
		int s = c - a;
		System.out.println(s);
		sc.close();
	}

}
/**************************************************************
	Problem: 1667
	User: admin
	Language: Java
	Result: Accepted
	Time:838 ms
	Memory:39576 kb
****************************************************************/