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: Accepted)

fun main(args: Array<String>) {
    for (i in 1..3000) {
        val inStr: String? = readLine()
        if (inStr === null) {
            return
        }
        val inStrList = inStr.split(' ')
        if (inStrList.size != 2) {
            return
        }
        val dataSets = inStrList.map { s -> s.toInt() }
        if (dataSets.any { n -> (n < 0) || (n > 10000) }) {
            return
        }
        if (dataSets.all { n -> n == 0 }) {
            return
        }
        val sortedDataSets = dataSets.sorted()
        val outString = sortedDataSets.joinToString(" ")
        println(outString)
    }
}