using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("num=");

         int num=int.Parse(Console.ReadLine());

        int a=num%10 ;

        int b =num%100/10 ;

        int e =num/10000%10;

        int dc=num/100%10 ;

        int gf=num/100000;

        if(num>=1000000&&num<=9999999)

        {

            if(a!=0 &&a!=1 && a!=2 && a!=3)

                Console.WriteLine("Invalid operation");

            else if (e!=0 && e!=0.1 && e!=1 && b!=0 && b!=0.1 && b!=1)

                Console.WriteLine("Invalid sign");

        }

    }

}