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 ITP1_3_C {
    class Program {
        static void Main(string[] args) {
            int i = 0;
            while(true) {
                i++;
                string[] s = Console.ReadLine().Split(' ');
                int x = int.Parse(s[0]);
                int y = int.Parse(s[1]);
                if(s[0] == "0" && s[1] == "0")
                    break;
                if(x <= y) {
                    Console.WriteLine("{0} {1}", x, y);
                } else if(x > y) {
                    Console.WriteLine("{0} {1}", y, x);
                }
            }
        }
    }
}