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)

process.stdin.resume();
process.stdin.setEncoding('utf8');
// ???????????????????¨??????§
// Let's ?????£??¬????????????
process.stdin.on('data', function (chunk) {
    var datas = chunk.split(/\n/);
     
    for (var i = 0; i < datas.length; i++) {
        var data = datas[i].split(' ').map(Number);
         
        if (data[0] === 0 && data[1] === 0) { break; }
         
        console.log(Math.min(data[0], data[1]) + " " + Math.max(data[0], data[1]));
    }
});