#include<iostream>
using namespace std;
int main()
{
    string username;
    int age;
    cin>>username;
    cin>>agge;
    if(username.length()<3)
    {
        cout<<"Invalid username";
        
    }
    else if(agae<18||age>100)
    {
      cout<<"Invalid age"  ;
    }
    else{
        cout<<"Regestration successful";
    }
    return 0;
}