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 sc = new java.util.Scanner(System.in)
  var cnt = false
  do {
      val x, y = sc.nextInt
      cnt = x != 0 || y != 0
      val res = if(x < y) s"$x $y"
      else s"$y $x"
      if(cnt) println(res)
  } while(cnt)
}