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: Wrong Answer)

object Main {
  def main(args:Array[String]) {
    for (line <- scala.io.Source.stdin.getLines() if line != "0 0") {
      if (line(0) < line(2)) {
        println(line(0) + " " + line(2))
      } else {
        println(line(2) + " " + line(0))
      }
    }
  }
}