Problem:
Swapping Two Numbers

Write a program which reads two integers x and y, and prints them in ascending order.

Input

The input consists of multiple datasets. Each dataset consists of two integers x and y separated by a single space.

The input ends with two 0 (when both x and y are zero). Your program should not process for these terminal symbols.

Output

For each dataset, print x and y in ascending order in a line. Put a single space between x and y.

Constraints

0 ≤ x, y ≤ 10000

the number of datasets ≤ 3000

Sample Input

3 2
2 2
5 3
0 0

Sample Output

2 3
2 2
3 5

Solution in JAVA (judge verdict: Accepted)

import java.io.*;
import java.util.*;


public class Main{

	public static void main(String args[]){
		ArrayList<Swap> list = new ArrayList<Swap>();
		Scanner scan = new Scanner(System.in);
		while(true){
			int x =  scan.nextInt();
			int y =  scan.nextInt();
			if(x==0 && y==0)
				break;
			list.add(new Swap(x,y));
		}
		scan.close();
		for(Swap s : list){
			s.smaller();
			System.out.println(s);
		}
		

	}

}

class Swap{
	int a;
	int b;
	public Swap(int x, int y){
		a = x;
		b = y;	
	}
	
	public void smaller(){
		if(a < b)
			return;
		int tmp = a;
		a=b;
		b=tmp;
	}

	@Override
	public String toString(){
		return a + " " + b;
	}

}