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)

int main(void){
               
    int s,t;
    while(1){
        scanf("%d %d",&s, &t);
        if((s=0) && (t=0)) break;
        if(s<t)
         printf("%d %d\n",t,s);
        else
         printf("%d %d\n",s,t);
    }
    return 0;
        
}