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: Output Limit Exceeded)

import java.io.*;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuilder output = new StringBuilder();
        int i = 0;
        while(i < 3000){
            String data[] = br.readLine().split(" ");
            int x = Integer.parseInt(data[0]);
            int y = Integer.parseInt(data[1]);
            if((0 <= x) && (y <= 10000)){
                if(x == 0 && y == 0){
                break;
                }
            output.append(Integer.toString(x<y?x:y)).append(" ").append(Integer.toString(x>y?x:y)).append("\n");
            i++;
            }
        System.out.print(output);
        }
    }
}