#include<iostream>
using namespace std;
int main()
{
    string name;
    int age;
    cin>>name;
    cin>>age;
    try
    {
        if(name.legth()<3 || age<18 || age>100)
        {
            throw "Invalid input";
        }
        cout<<"Registration successful";
    }
    catch(const char* msg)
    {
        cout<<msg;
    }
}