Favorite Movie

using System;

namespace FavoriteMovie
{
    class Program
    {
        public static void Main()
        {
            string bestMovie = "";
            int asciiSum = 0;
            int counter = 0;
            string movie = Console.ReadLine();

            while (movie != "STOP" && counter != 7)
            {
                int currentAscii = 0;
                for (int j = 0; j < movie.Length; j++)
                {
                    currentAscii += movie[j];
                    if (movie[j] > 96 && movie[j] < 123)
                    {
                        currentAscii -= movie.Length * 2;
                    }
                    else if (movie[j] > 64 && movie[j] < 91)
                    {
                        currentAscii -= movie.Length;
                    }

                    if (currentAscii > asciiSum)
                    {
                        bestMovie = movie;
                        asciiSum = currentAscii;
                    }
                }
                counter++;
                movie = Console.ReadLine();
            }
            if (counter == 7)
            {
                Console.WriteLine("The limit is reached.");
            }
            Console.WriteLine($"The best movie for you is {bestMovie} with {asciiSum} ASCII sum.");
        }
    }
}

Решение с for:

using System;

namespace FavoriteMovie
{
    class Program
    {
        public static void Main()
        {
            string bestMovie = "";
            int asciiSum = 0;
            bool isStop = false;

            for (int i = 0; i < 7; i++)
            {
                string movie = Console.ReadLine();
                if (movie == "STOP")
                {
                    isStop = true;
                    break;
                }
                int currentAscii = 0;
                for (int j = 0; j < movie.Length; j++)
                {
                    currentAscii += movie[j];
                    if (movie[j] > 96 && movie[j] < 123)
                    {
                        currentAscii -= movie.Length * 2;
                    }
                    else if (movie[j] > 64 && movie[j] < 91)
                    {
                        currentAscii -= movie.Length;
                    }

                    if (currentAscii > asciiSum)
                    {
                        bestMovie = movie;
                        asciiSum = currentAscii;
                    }
                }
            }

            if (isStop == false)
            {
                Console.WriteLine("The limit is reached.");
            }
            Console.WriteLine($"The best movie for you is {bestMovie} with {asciiSum} ASCII sum.");
        }
    }
}