#include<iostream>
using namespace std;
int main(){
	int a,b;
	while(1){
		cin >> a >> b;
		if(a+b == 0)break;
		if(a>b){
			swap(a,b);
		}
		cout << a << " " << b << endl;
	}
	return 0;
}
### Prompt

Please create a solution in CPP 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 a,b;
	while(1){
		cin >> a >> b;
		if(a+b == 0)break;
		if(a>b){
			swap(a,b);
		}
		cout << a << " " << b << endl;
	}
	return 0;
}
```