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';
(function(stdin) {

  var inputs  = stdin.toString().trim().split('\n');
  var EOF = inputs.indexOf('0 0');
  var matrics = inputs.slice(0, EOF).map(function(v) {
    return v.split(' ').map(Number);
  });

  matrics.map(function(v){
    return v.sort(function(a, b){ return a - b;})
  });

  function print(line){
  return line.map(function(v){return v.join(' ');}).join('\n');
    }

  console.log(print(matrics));

}(require('fs').readFileSync('/dev/stdin', 'utf8')));