import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String[] strAry = sc.next().split("");
		
		int[] intAry = new int[3];
		for (int i = 0; i < 3; i++) {
			intAry[i] = Integer.parseInt(strAry[i]);
		}
		
		int max = Math.max(Math.max(intAry[0], intAry[1]), intAry[2]);
		int min = Math.min(Math.min(intAry[0], intAry[1]), intAry[2]);
		int result = max - min;
		System.out.println(result);
		
		sc.close();
	}
}