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: Accepted)

//ITP1_3_C
#include<iostream>
using namespace std;

int main()
{

	while(1){
	int x,y;
	
	cin>>x>>y;
	
	if(x == 0&&y == 0)
	break;
	
	if(y<x)
	cout<<y<<" "<<x<<endl;
	
	else
	cout<<x<<" "<<y<<endl;
	
	}
	
	return 0;
}