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 C++ (judge verdict: Time Limit Exceeded)

#include <iostream>
 int main() {
  int x, y;
   std::cin >> x >> y;
    while (1) { 
     if (x == 0 && y == 0) break;
     if (x > y) {
      std::cout << y << x <<std::endl;
     } else {
      std::cout << x << y <<std::endl;
     }



    }


 return 0;



}