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 <stdio.h>

int main(void)
{
  int x, y;

  while(1)
    {
      scanf("%d %d", &x, &y);

      if(x=y=0)
        break;

      else if(y<x)
        printf("%d %d\n", y, x);

      else
        printf("%d %d\n", x, y);
    }
  return 0;
}