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.readLine

object Main {

  def main(args: Array[String]) = {
      var n = readLine.split(" ").map(_.toInt)
      while( n(0)!= 0 || n(1) != 0) {

          if(n(0)<n(1)) println(n(0)+" "+n(1))
          else println(n(1)+" "+n(0))
          n = readLine.split(" ").map(_.toInt)
      }
  }
}