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(int argc, const char * argv[]) {
    int x,y;
    while (1) {
    scanf("%d %d",&x,&y);
    if (x<y){
        printf("%d %d\n",x,y);
    } else {
        printf("%d %d\n",y,x);
    }
    }
}