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: Wrong Answer)

var readable = process.stdin;
readable.resume();
readable.setEncoding( 'utf-8' );
readable.on( 'data', function( chunk ) {
  var data = chunk.replace( /\n/, '' ).split( ' ' );
  var a = parseInt( data[0] );
  var b = parseInt( data[1] );
  if( 0 == a && 0 ==  b ) return;
 
  if( b < a ) {
    var t = a;
    a = b;
    b = t;
  }
  
  console.log( '%d %d', a, b );
});