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.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

class Main {

	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringBuilder sb = new StringBuilder();
		int count = 1;
		while(true) {
			if (count > 3000) {
				break;
			}
					
			String input = br.readLine();
			String[] inputList = input.split(" ");
			int a = Integer.parseInt(inputList[0]);
			int b = Integer.parseInt(inputList[1]);
			
			if (a == 0 && b == 0) break;
			
			if (!((a >= 0 && a <= 10000) && (b >= 0 && b <= 10000)))
				throw new IllegalArgumentException();
	
			if (a > b)
				sb.append(a + " " + b + "\n");
			else
				sb.append(b + " " + a + "\n");
			
			count++;
		}
		
		System.out.println(sb.toString());
	}
}