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 io.Source.stdin

object Main {
  
  def main(args: Array[String]) {
    for ((list) <- stdin.getLines().toList.takeWhile(_ != "0 0").map(_.split(" "))) {
      val x = list(0).toInt
      val y = list(1).toInt
      if (x < y) println(s"$x $y")
      else println(s"$y $x")
    }
  }
}