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: Runtime Error)

process.stdin.resume();
process.stdin.setEncoding('utf8');
process.stdin.on('data', function (chunk) {
    var lines = chunk.toString().split(' ');
    var x = lines; //???????????°???????????????????????????
    for(i=0; i<x.length; i++){
        x[i] = parseInt(x[i], 10);
    }
    
    if(x[0] === 0 && x[1] === 0)
      break;
    else if(x[0]<x[1])
      console.log(x[0]+" "+x[1]);
    else if(x[0]>x[1])
      console.log(x[1]+" "+x[0]); 
});