C++ :

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

int main(){
    int n,q,b,s,g,y,d;
    cin>>n;
     q = n / 1000;
     b = n / 100 % 10;
     s = n / 10 % 10;
     g = n % 10;
     y = g * 1000 + s * 100 + b * 10 + q;
     d = y - n;
     cout<<y<<"-"<<n<<"="<<d<<endl;
}

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/1000;
        int b = x/100%10;
        int c = x/10%10;
        int d = x%10;
        int y = 1000*d+100*c+10*b+a;
        int z = y-x;
        System.out.println(y+"-"+x+"="+z);
    
    }
}