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>
#include <sstream>
#include <math.h>
#include <algorithm>
using namespace std;
int main(){
    while (1){
        int i, j ;
        cin >> i >> j ;
        if ( i <= j) {
            cout << i << " " << j << endl;
        } else{
            cout << j << " " << i << endl;
        }
        
    }
    return 0;
}