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 scala.io.StdIn

object Main extends App {
  
  def loop(x: Int, y: Int): Unit = {
    if(x != 0 || y != 0){
      if(x <= y) println(x + " " + y)
      else println(y + " " + x)

      val Array(nextx, nexty) = StdIn.readLine().trim.split(' ').map(_.toInt)
      loop(nextx, nexty)
    } 
  }

  val Array(fx, fy) = StdIn.readLine().trim.split(' ').map(_.toInt)

  loop(fx, fy)

}