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)

using System;

class SwappingTwo{
        static void Main(string[] args){
	  while(true){
	    string[] str = Console.ReadLine().Split(' ');
	    int x = int.Parse(str[0]);
	    int y = int.Parse(str[1]);
	    if(x == 0 && y == 0) break;
	    if(x > y){
	      int t = x; x = y; y = t;
	    }
	    Console.WriteLine("{0} {1}",x,y);
	  }
	}
}