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)

require('fs').readFileSync(0, 'UTF-8').split('\n').some(input => {
  const [x, y] = input.trim().split(' ').map(Number)
  if (x === 0 && y === 0) { return true }
  if (x < y) {
    console.log(x, y)
  } else {
    console.log(y, x)
  }
})