C++ :

#include <bits/stdc++.h>
using namespace std;

int main() {
	int n,a,b,c;
	cin>>n;
	a = n / 100;
	b = n / 10 % 10;
	c = n % 10;
	
	if(a < b) swap(a,b);
	if(b < c) swap(b,c);
	if(a < b) swap(a,b);
	
	cout<<a*100+b*10+c - (c*100+b*10+a);
}

Java :

import java.util.Scanner;
public class Main
{   
	public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int x = sc.nextInt();
        int a = x/100%10;
        int b = x/10%10;
        int c = x%10;
        int y = a+b+c;
        int max = a;
        if(max<b) {
        	max=b;
        }
        if(max<c) {
        	max=c;
        }
        
        int min = a;
        if(min>b) {
        	min=b;
        }
        if(min>c) {
        	min=c;
        }
        
        System.out.print((max*100+min+(y-max-min)*10)-(min*100+max+(y-max-min)*10));
       
    }
}

Python :

n = int(input())
b = n // 100 % 10
s = n // 10 % 10
g = n // 1 % 10
if b < s:
    s, b = b, s
if s < g:
    g, s = s, g
if b < s:
    s, b = b, s
print((b * 100 + s * 10 + g) - (g * 100 + s * 10 + b))