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)

'use strict';
process.stdin.on('data', function(chunk) {
  // ????????????????????????
  var inputs = chunk.toString().trim().split('\n');
  for (var i = 0; i < inputs.length; i++) {
    if (inputs[i] === '0 0') {
      break;
    }
    var cols = inputs[i].split(' ').map(Number);
    console.log(
      cols.sort(function(a,b) {
        return a - b;
      }).join(' ')
    );
  }
});
process.stdin.resume();
process.stdin.setEncoding('utf8');