{
            int start = 0;
            bool f = false;
            int noOfDigits = 1;
            long firstItemOfSequence = 0;
            string string_modified = str;
            while (start <= str.Length)
            {
                string firstAsString = str.Substring(start, noOfDigits);
                int currentPosition = firstAsString.Length + str.IndexOf(firstAsString);
                long firstAsNumber = long.Parse(firstAsString);
                if (firstItemOfSequence == 0) firstItemOfSequence = firstAsNumber;
                long secondNumber = firstAsNumber + 1;
                str = str.Substring(currentPosition, str.Length - currentPosition);
                if (str.IndexOf(secondNumber.ToString()) == 0)
                {
                    start = str.IndexOf(secondNumber.ToString());
                    f = true;
                    currentPosition = secondNumber.ToString().Length + str.IndexOf(secondNumber.ToString());
                    noOfDigits = secondNumber.ToString().Length;
                }
                else if (firstAsString.Length >= string_modified.Length / 2) break;
                else
                {
                    f = false;
                    start = 0;
                    firstItemOfSequence = 0;
                    noOfDigits++;
                    str = string_modified;
                }
                if (currentPosition == str.Length) break;
            }
            if (f) Console.WriteLine($"YES {firstItemOfSequence}");
            else Console.WriteLine("NO");

        }