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)

function main(input) {
    // "0 0"???????????????????????????????´????????????????
    var index = input.indexOf('0 0');
    var output =[];
    //????????§????????£??????????????????????????????0 0????????§??????
    for (var i=0; i <index; i++){
        var a = input[i].split(' ');
        if(parseInt(a[1]) < parseInt(a[0])){
            output.push(a[1]+ ' ' +a[0]);
        }
        else{
            output.push(input[i]);
        }
    }
    console.log(output.join('\n'));
}

  
  process.stdin.resume();
  var input = '';  
  process.stdin.setEncoding('utf-8');
  process.stdin.on('data', function(chunk) {
    input += chunk;
  });
  process.stdin.on('end', function() {
    var inputData = input.split('\n');
    main(inputData);
  });