using System;

public class test
{
   public static bool IsVowel(char letter)
   {
      if(letter == 'a' || letter == 'e' ||
         letter == 'i' || letter == 'o' || letter == 'u')
            return(true);
      else
            return(false);
   }

   public static string RemoveVowels(string s)
   {
      string result = "";

      foreach(char letter in s)
      {
         if(IsVowel(letter) != true)
            result += letter;
      }

      return(result);
   }

   public static void Main()
   {
      string[] list =
      {
         "abcdefghijklmnopqrstuvwxyz",
         "hello, is there anybody home?",
         "the quick brown fox jumps over the lazy dog"
      };

      foreach(string s in list)
      {
         Console.WriteLine("before: [{0}]", s);
         Console.WriteLine("after : [{0}]\n", RemoveVowels(s));
      }
   }
}