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)

var x = require('fs').readFileSync('/dev/stdin/', 'utf8');
var row = x.split("\n");
for (var index in row){
    var i = row[index].split(" ").map(Number);
    var a = i[0]; b = i[1];
    if (a === 0 && b === 0) break; 
    else {
        console.log(i.sort(function(a, b){return a - b}).join(" "));
    }
}