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{
    int x,y,tmp;
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    while (true){
      String[] line = br.readLine().split(" ");
      x = Integer.parseInt(line[0]);
      y = Integer.parseInt(line[1]);
      if(x==0 && x==y){
        break;
      }else if(x>y){
        tmp = x;
        x = y;
        y = tmp;
      }
      System.out.println(x+" "+y);
    }
  }
}