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)

(stdin => {
  // Define Function
  const nsort = ([a, b]) => [a, b].sort((x, y) => x - y).join(' ')

  // Declare Variable
  const inputs = stdin.toString().trim().split('\n')
  const nlist = inputs.slice(0, -1)
    .map(v => v.split(' ').map(Number))

  const result = Array.from(nlist, nsort)

  console.log(result.join('\n'))
})(require('fs').readFileSync('/dev/stdin', 'utf8'))