02. String Decryption

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace _07.TravellCompany
{

    class Program
    {
        static void Main(string[] args)
        {

            int[] arr = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
            int m = arr[0];
            int n = arr[1];
            List<int> list = Console.ReadLine().Split(' ').Select(int.Parse).ToList();
            List<int> letterList = new List<int>();
            letterList = list.Where(x => x >= 65 && x <= 90).Skip(m).Take(n).Select(x => x).ToList();

            foreach (var item in letterList)
            {
                Console.Write((char) item);
            }
        }
    }
}