Find the number of All Capital Letters from a given string in C#

  class CheckCapitalChar

    {

        public static string CountCapital(string str)

        {

            StringBuilder sb = new StringBuilder();

            for (int i = 0; i < str.Length - 1; i++)

            {

                char ch = str[i];

                if (char.IsUpper(ch))

                {

                    sb.Append(ch);

                }

            }

            return sb.ToString();

        }

        public static void Main()

        {

            Console.WriteLine("Enter the string");

            string str = Console.ReadLine();

            string result = CountCapital(str);

            Console.WriteLine(result);

            Console.ReadLine();

        }

    }

Output: