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)

main(require("fs").readFileSync("/dev/stdin", "utf8").replace(/\r?\n$/, "").split(/\r?\n/));

function main(lines){
	lines.some(function(str){
		if(str == "0 0") return true;
		console.log(str.split(" ").map(Number).sort(function(a,b){return a-b;}).join(" "));
	});
}