C :

#include<stdio.h>
int main(){
	int a,b,t;
	scanf("%d %d",&a,&b);
	t=a;
	a=b;
	b=t;
	printf("%d %d\n",a,b);
	return 0;
}

C++ :

#include<bits/stdc++.h>
using namespace std;
int a,b;
int main()
{
	cin>>a>>b;
	swap(a,b);
	cout<<a<<" "<<b;
   return 0;
}

Pascal :

var a,b:longint;
begin
  readln(a,b);
  writeln(b,' ',a);
end.

Java :

import java.util.*;
public class Main {
	public static void main(String[] args) {
		Scanner input=new Scanner(System.in);
		int n=input.nextInt();
		int m=input.nextInt();
		System.out.print(m+" ");
		System.out.print(n);
	}
}