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.io.IOException;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) throws IOException {
		//キーボード入力メソッド
		Scanner sc = new Scanner(System.in);

		int x = 1;
		int y = 1;

		while(true) {
			x = sc.nextInt();
			y = sc.nextInt();

			//処理　xとyを小大の順で並べる
			if(x > y) {
				System.out.println(y + " " + x);
			}else {
				System.out.println(x + " " + y);
			}

			//xが0のとき、終了
			if(x == 0 && y == 0) {
				break;
			}
		}
	}

}