#include<iostream>

using namespace std;

int main(){
  int x,y;
  while(true){
    cin >> x >> y;
    if(x==0&&y==0) break;
    if(x<y) cout<<x<<" "<<y<<endl;
    else cout<<y<<" "<<x<<endl;
  }
}
### Prompt

Your task is to create a cpp solution to the following problem:

Write a program which reads two integers x and y, and prints them in ascending order.

Constraints

* 0 ≤ x, y ≤ 10000
* the number of datasets ≤ 3000

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.

Example

Input

3 2
2 2
5 3
0 0


Output

2 3
2 2
3 5

### Response

```cpp
#include<iostream>

using namespace std;

int main(){
  int x,y;
  while(true){
    cin >> x >> y;
    if(x==0&&y==0) break;
    if(x<y) cout<<x<<" "<<y<<endl;
    else cout<<y<<" "<<x<<endl;
  }
}
```