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){
  const arr = input.split('\n');
  let nums, a, b;

  for (let i = 0; i < arr.length; i++){
    nums = arr[i].split(' ').map(Number);
    a = nums[0];
    b = nums[1];
    if (a === 0 && b === 0){
      break;
    } else if (a > b) {
      console.log(b, a);
    } else {
      console.log(a, b);
    }    
      }
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));