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)

process.stdin.setEncoding('utf-8');
process.stdin.on('data', (input) => {
  var arry = input.split(' ');
  var a = parseInt(arry[0]);
  var b = parseInt(arry[1]);
  if (a == 0 && b == 0) {
    process.exit(); 
  } else if (a < b){
    console.log(a, b);
  } else {
    console.log(b, a);
  }
})