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);

    const shouldTerminate = numbers[0] === 0 && numbers[1] === 0;

    if (!shouldTerminate) {
    	if (numbers[0] - numbers[1] >= 0) {
    		const item = numbers[0];
			numbers[0] = numbers[1];
			numbers[1] = item;
    	}

	    const output = numbers;
	    // to here

	    console.log(output[0].toString(), output[1].toString());
	}
}