Console.Write("Enter array`s lenghts: ");
            int n = int.Parse(Console.ReadLine());

            string[] books = new string[n];
            string[] authors = new string[n];


            for (int i = 0; i < books.Length; i++)
            {
                Console.WriteLine("The name of the book: ");
                books[i] = Console.ReadLine();
                Console.WriteLine("The name of the author: ");
                authors[i] = Console.ReadLine();
            }

            for (int i = 0; i < books.Length; i++)
            {
                if (authors[i].Trim().ToLower()=="ivan vazov")
                {
                    Console.WriteLine("The book is {0} by the author {1}.",books[i],authors[i]);
                }
            }