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)

const input = require('fs').readFileSync('/dev/stdin', 'utf8');

const lines = input.trim().split('\n');

while (line = lines.shift()) {

    const numbers = line.split(' ').map(Number);
    // Edit from here
    let a = numbers[0];
    let b = numbers[1];

    if ( a === 0 && b === 0 ) { break; }

    if ( a > b ) {
        const tmp = a;
        a = b;
        b = tmp;
    } 

    const output = a + ' ' + b;

    console.log(output);
    // to here
}