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.IOException;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		String str;
		String[] arrStr;
		StringBuilder output = new StringBuilder();
		int a,b;
		try {

			while(true){
				str = br.readLine();

				if(str.equals("0 0")){
					// ??????
					break;
				}

				arrStr = str.split(" ");
				a = Integer.parseInt(arrStr[0]);
				b = Integer.parseInt(arrStr[1]);

				if(a<b){
					output.append(a).append(" ").append(b).append("\n");
				}else{
					output.append(b).append(" ").append(a).append("\n");
				}
			}
			System.out.print(output.toString());
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}