using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SHAEBASHIT_BYDEM
{
    public delegate int F(char, string);
    class Program
    {
        static int Counter(char ch, string str)
        {
            int counter = 0;
            foreach (var e in str)
            {
                if (e == ch) counter++;
            }
            return counter;
        }

        static int IndexOf(char ch, string str)
        {

            char[] array = str.ToCharArray();
            bool flag = false;
            int temp = 0;
            for (int i = 0; i < array.Length - 1; i++)
            {
                if (array[i] == ch)
                {
                    flag = true;
                    temp = i;
                    if (flag) break;
                }
            }
            if (!flag) return -1;

            return temp;
        }

        static void Main(string[] args)
        {


        }

        public static LinkedList<int> Method_Phibonaci(LinkedList<int> list, Func<char,string,int> f)
        {
            list.AddLast(f(list));
            return list;
        }


    }
}