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.*;

class Main {
    public static void main(String[] args) {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));// ??\????????????????????????
            String line;
            while((line = br.readLine()) != null){
            	String[] list = line.split(" ", 0);
            	int a = Integer.parseInt(list[0]);
            	int b = Integer.parseInt(list[1]);
            	
            	if(a == 0 && b == 0){
            		break;
            	}else if(a < b){
            		System.out.println(a + " " + b);
            	}else if(a > b){
            		System.out.println(b + " " + a);
            	}else if(a == b){
            		System.out.println(a + " " + b);
            	}
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}