05. Word in Plural

using System;

namespace _05_wordInPlural
{
    class Program
    {
        static void Main(string[] args)
        {
            string word = Console.ReadLine().ToLower();
            int wordLenght = word.Length;
            bool endsInY = word.EndsWith("y");
            bool endsInOtoH = word.EndsWith("o") || word.EndsWith("ch") || word.EndsWith("s") || word.EndsWith("sh")
                || word.EndsWith("x") || word.EndsWith("z") || word.EndsWith("h");

            if (endsInY)
            {
                word = word.Remove(wordLenght - 1, 1);
                word = word + "ies";
            }
            else if (endsInOtoH)
            {
                word = word + "es";
            }
            else
            {
                word = word + "s";
            }
            Console.WriteLine(word);
        }
    }
}