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');
  var cols = inputs.filter(function(v) {
    return v !== '0 0';
  })
  .map(function(v) {
    return v.split(' ')
          .map(Number)
          .sort(function(a ,b) {
            return a - b;
          })
          .join(' ');
  })
  .join('\n');
  
  console.log(cols);
  
});
process.stdin.resume();
process.stdin.setEncoding('utf8');