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.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int[][] num = new int[10000][10000];
		for(int i = 0; i < num.length; i++) {
			for(int j = 0; j < 2; j++) {
				num[i][j] = scan.nextInt();
			}
			if(num[i][0] == 0 && num[i][1] ==0) break;
		}
		for(int i = 0; i < num.length; i++) {
			if(num[i][0] == 0 && num[i][1] == 0) break;
			if(num[i][0] > num[i][1]) {
				int tmp = num[i][0];
				num[i][0] = num[i][1];
				num[i][1] = tmp;
			}
			System.out.println(num[i][0] + " " + num[i][1]);
		}
	}
}