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 {
  def main(args:Array[String]){
    try{
      while(true){
        var numAry=io.StdIn.readLine.split(" ").map(_.toInt).sorted
        if(numAry(1)==0) throw new Exception
        println(numAry.mkString(" "))
      }
    }
    catch{
      case _:Exception=>()
    }
  }
}