using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

public class Program

{

            public static void Main()

            {        

                 string word = "betű";

            var edit = new StringBuilder(word);

            char x = word[word.Count()-1];

            string lastTwo = word.Substring(word.Count()-2);

            char[] allVow = {'a','e','i','o','u','á','é','í','ó','ö','ő','ú','ü','ű'};

            char[] frontVow = {'e', 'é', 'i', 'í', 'ö', 'ő', 'ü', 'ű'};

            string[] diGraphs = {"sz", "zs", "cs"};

            string toAdd = "";

             switch(x)

                     {

               case 'a':

                 toAdd += "á";

                            break;

               case 'e':

                 toAdd += "é";

                 break;

               case 'i':

                 toAdd += "í";

                 break;

               case 'o':

                 toAdd += "ó";

                 break;

               case 'ö':

                 toAdd += "ő";

                 break;

               case 'ü':

                 toAdd += "ű";

                 break;               

                     }

        if(diGraphs.Contains(lastTwo)){

           string add = "";

           switch(lastTwo)

           {

               case "sz":

                  add += "ssz";

                  break;

               case "zs":

                  add += "zzs";

                  break;

               case "cs":

                  add += "ccs";

                  break;

           }

                edit.Remove(word.Count()-2, 2);

                edit.Insert(word.Count()-2, add);

              //  edit.Insert(word.Count(), ()? "vel":"val");    

        }else if(allVow.Contains(x))

            {                                    

                edit.Remove(word.Count()-1, 1);

                edit.Insert(word.Count()-1, toAdd);

                edit.Insert(word.Count()-1, (frontVow.Contains(x))? "vel":"val");                                      

             }

              string res = edit.ToString();

              Console.WriteLine(res);

    }

}