string input = "";
char[] vovels = {'a','o','e','u','i'};
char[] alphabet =  {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
char matched_character = input.toCharArray()[0];
if(alphabet.contains(matched_character)){
    if(vovels.contains(matched_character)
        Console.Write(input + "is a vovel");
    else
        Console.Write(input + "is a consonant");
}
else
    Console.Write(input + "is not a character");