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.BufferedReader;
import java.io.InputStreamReader;
class Main {
    public static void main(String[] args) throws Exception{
            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));// ??\????????????????????????
            String line = null;
            while((line = br.readLine()) != null){
            	String lines[] = line.split(" ");
            	int x = Integer.parseInt(lines[0]);
            	int y = Integer.parseInt(lines[1]);
            	if(x == 0 && y == 0)break;
            	System.out.println(y>x ? x+" "+y : y+" "+x);
            }
    }
}