#include<iostream>
#include<cstdio>
#include<algorithm>
using namespace std;
int main(){
int x,y;
while(scanf("%d%d",&x,&y)&&x||y){
	if(x>y)swap(x,y);
	printf("%d %d\n",x,y);
}

return 0;
}
### Prompt

Please formulate 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>
#include<cstdio>
#include<algorithm>
using namespace std;
int main(){
int x,y;
while(scanf("%d%d",&x,&y)&&x||y){
	if(x>y)swap(x,y);
	printf("%d %d\n",x,y);
}

return 0;
}
```