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 JAVA (judge verdict: Accepted)

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
 
public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader reader=new BufferedReader(new InputStreamReader(System.in));
        StringBuilder builder=new StringBuilder();
        while(true){
            String data[]=reader.readLine().split(" ");
            int x=Integer.parseInt(data[0]);
            int y=Integer.parseInt(data[1]);
            if(x==0 && y==0) break;
            builder.append(Integer.toString(x<y?x:y)).append(" ").append(Integer.toString(x<y?y:x)).append("\n");
        }
        System.out.print(builder);
    }
}