#include<iostream>
using namespace std;

int main()
    {
        string username;
        int age;
        
        cin>>username;
        cin>>age;
        
        if(username.length()<3)
        {
            cout<<"Invalid username";
            
        }
        else if(age<18 || age>100){
              cout<<"Invalid age";
        }
    }    
{
    }
    else
    {
        cout<<"Registeation successful";
    }
    return 0;
}