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;
  int y;

  scanf("%d",&x);
  scanf("%d",&y);

  while(1){
    if(x==0 && y==0)
      break;
    else
      if(x<y)
        printf("%d %d\n",x,y);
      else
        printf("%d %d\n",y,x);
  }
  return 0;
}