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 {
    import scala.annotation.tailrec

    def main(args: Array[String]) = {
        val sc = new java.util.Scanner(System.in)

        output(sc)
    }

    @tailrec
    def output(scanner: java.util.Scanner): Unit = {
        val x, y = scanner.nextInt

        if( x != 0 || y != 0 ) {
            println(if( x < y ) x + " " + y else y + " " + x)
            output(scanner)
        }
    }

}