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: Wrong Answer)

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner stdin = new Scanner(System.in);
		int arr[] = new int[3000];
		int x,y, i = 0, temp = 0;
		do {
			x = stdin.nextInt();
			y = stdin.nextInt();
			if (x > y) {
				arr[i] = y;
				arr[i + 1] = x;
			} else {
				arr[i] = x;
				arr[i + 1] = y;
			}
			i += 2;
		} while (x != 0 && y != 0);

		for (i = 0; i < arr.length; i += 2) {
			if (arr[i] == 0 && arr[i + 1] == 0) {
				break;
			} else {
				System.out.println(arr[i] + " " + arr[i + 1]);
			}
		}
	}
}