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.collection.JavaConverters._

object Main extends App {
  val scanner = new java.util.Scanner(System.in).asScala

  val data = scanner.map { x =>
    val y = scanner.next
    (x.toInt, y.toInt)
  }.takeWhile(t => !(t._1 == 0 && t._2 == 0)).toList

  data.foreach {
    case (x, y) =>
      val result = if(x < y) {
          s"$x $y"
        } else {
          s"$y $x"
        }
      println(result)
  }
}