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 gInput = require('fs').readFileSync('/dev/stdin', 'utf8')
const input = gInput.split('\n').map( line => line.split(' ').map( s => parseInt(s)))

for(let nums of input){
    const [a,b] = nums.sort((x,y)=> x-y)
    if( a ===  0 && b === 0 ){ break }
    console.log(`${a} ${b}`)
}