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 Scala (judge verdict: Accepted)

import java.util.Scanner

import scala.collection.mutable.ListBuffer
import scala.util.control.Breaks

object Main {
  def main (args: Array[String]) = {
        val in = new Scanner(System.in)
        var list = new ListBuffer[String]

        val brk = new Breaks
        brk.breakable {
          while (true) {
            val first = in.nextInt
            val second = in.nextInt
            if (0 != first || 0 != second) {
              val great = Math.max(first, second)
              val less = Math.min(first, second)
              list += less + " " + great
            } else brk.break()
          }
        }

        list.foreach(println(_))
  }
}