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

object Main {
  def main(args: Array[String]): Unit = {
    val inputs = Iterator.continually(StdIn.readLine()).takeWhile(_ != null)
    inputs.map(_.split(" ").map(_.toInt)).foreach{
      case Array(0, 0) =>
      case Array(a, b) if a <= b => println(s"$a $b")
      case Array(a, b) if a > b => println(s"$b $a")
    }
  }
}