백준 C# - 5086

using System;
using System.Collections.Generic;
namespace baek2
{  
    class Program
    {        
        static void Main(string[] args)
        {
            while(true)
            {
                string[] token = Console.ReadLine().Split();
                int first = int.Parse(token[0]);
                int second = int.Parse(token[1]);

                if (first == 0 & second == 0) return;

                if ((first % second) == 0)
                    Console.WriteLine("multiple");
                else if((second % first) == 0)
                    Console.WriteLine("factor");
                else
                    Console.WriteLine("neither");   
            }
        }
    }
}