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) throws IOException {
        final BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        final StringBuilder sb = new StringBuilder();
        while (true) {
            final String line = br.readLine();
            final int index = line.indexOf(" ");
            final int x = Integer.parseInt(line.substring(0, index));
            final int y = Integer.parseInt(line.substring(index+1, line.length()));
            if (x == 0 && y == 0) break;
            sb.append(x < y ? x + " " + y : y + " " + x).append("\n");
        }
        System.out.print(sb);
    }
}