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: WA: Presentation Error)

"use strict";

function Main(input) {
    input=input.split("\n");
    var line=input.map(function(v){
                       return v.split(" ").map(Number); 
});
    var ans="";
    for(var i=0;line[i][0]+line[i][1];i++){
        line[i].sort(function(a,b){
            return a-b;
        });
        ans+=line[i].join(" ")+"\n";
    }
    console.log(ans);
}
function debug(){
	var input = document.getElementById("input").value;
	Main(input);
}

Main(require("fs").readFileSync("/dev/stdin", "utf8"));