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)

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

  val data = Iterator.continually {
    val x = scanner.nextInt
    val y = scanner.nextInt

    (x, y)
  }.takeWhile(t => !(t._1 == 0 && t._2 == 0)).toList

  val outputs = data.map {
    case (x, y) =>
      if(x < y) {
        s"$x $y"
      } else {
        s"$y $x"
      }
  }

  outputs.foreach(println)
}