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 Kotlin (judge verdict: Wrong Answer)

fun main(args: Array<String>) {
    var r: String? = ""
    while({r = readLine();r}() != "0 0") {
        println(r?.split(" ")?.map{ it.toInt() }?.reversed()?.joinToString (" "))
    }
}