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;

namespace CA {
	class Prg {
		static void Main() {
			string[] str = new string[2];
			while(true){
				str = Console.ReadLine().Split(' ');
				if (int.Parse(str[0]) < int.Parse(str[1])) Console.WriteLine("{0} {1}", str[0], str[1]);
				else if (str[0] == "0" && str[1] == "0") break;
				else Console.WriteLine("{1} {0}", str[0], str[1]);
			}
		}
	}
}