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 JavaScript (judge verdict: Accepted)

let input = require('fs').readFileSync( '/dev/stdin', 'utf8' );
let arr = input.split("\n");
for (let i = 0; i < arr.length; i ++) {
    let ab = arr[i].split(" ").map(Number);
    if (ab[0] === 0 && ab[1] === 0) break;
    console.log("%d %d",  Math.min(ab[0], ab[1]), Math.max(ab[0], ab[1]));
}