using System;
    class Program
    {
        enum identificator
        {
            Simple_Identificator,
            Operation_All,
            Identificator,
            Error
        }
        static bool symbol(char a)
        {
            return a >= 'A' && a <= 'Z';
        }

        static bool operation(char a)
        {
            return a == '+' || a == '-' || a == '/' || a == '*';
        }

        static identificator recursion(string a, int pos = 0)
        {
            if (a.Length != pos)
            {
                if (pos % 2 == 0) return symbol(a[pos]) ? recursion(a, pos + 1) : identificator.Error;
                return operation(a[pos]) ? recursion(a, pos + 1) : identificator.Error;
            }
            return identificator.Simple_Identificator;
        }

        static identificator check(string a)
        {
            if (a.Length == 1)
            {
                if (operation(a[0])) return identificator.Operation_All;
                if (symbol(a[0])) return identificator.Identificator;
            }
            if (a.Length % 2 == 0) return identificator.Error;
            return recursion(a);
        }

        public static void Main()
        {
            circle();
        }
        static void circle()
        {
            identificator ident = check(Console.ReadLine());
            if (ident == identificator.Simple_Identificator) Console.WriteLine("Statement");
            else if (ident == identificator.Identificator) Console.WriteLine("Identificator");
            else if (ident == identificator.Operation_All) Console.WriteLine("Operation");
            else Console.WriteLine("Invalid input");
            circle();
        }
    }