C :

#include<stdio.h>
int main()
{
    long long m;
    long long n,t;
    scanf("%lld",&m);
    n=m/1000;
    t=m-n*1000;
    if(n>t)
        printf("%lld",m);
    else
        printf("%lld",t*1000+n);
    return 0;
}

C++ :

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

int main(){
    int n;
    cin>>n;
	if(n / 1000 > n % 1000){
		cout<<n;
	}else{
		cout<<n%1000<<n/1000;
	}
}
 

Java :

import java.util.Scanner;

public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int q = a/1000;
		int h = a%1000;
		
		
		if (q<h) {
			System.out.println(h*1000+q);
		}else {
			System.out.println(q*1000+h);
		}
		
	}

}

Python :

n = int(input())
sw = n // 100000 % 10
w = n // 10000 % 10
q = n // 1000 % 10
b = n // 100 % 10
s = n // 10 % 10
g = n // 1 % 10
x = sw * 100 + w * 10 + q
y = b * 100 + s * 10 + g
if x > y:
    print(n)
else:
    print(b * 100000 + s * 10000 + g * 1000 + sw * 100 + w * 10 + q)