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)

function main(input){
    let lines = input.split("\n");
    let i=0;
    while(lines[i]!=="0 0"){
        let nums = lines[i].split(" ");
        let put="";
        if(parseInt(nums[0])>parseInt(nums[1])){
            put=nums[1]+" "+nums[0];
        }else{
            put=nums[0]+" "+nums[1];
        }
        console.log(put);
        i++;
        
    }
    
    
}


main(require("fs").readFileSync("/dev/stdin","utf-8"));