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)

const input = require('fs').readFileSync('/dev/stdin', 'utf8');

const lines = input.trim().split('\n');

    lines.forEach(function(val){
        const dataStrings = val.split(' ');
        
        const x = Number(dataStrings[0]);
        const y = Number(dataStrings[1]);
        if (x === 0 && y === 0) {
          return false;
        } else {
          if (x < y) {
          console.log(x +' '+ y);
        } else {
          console.log(y +' '+ x);
        }
        }
      });