#include<iostream>
using namespace std;

int main()
    {
        strin 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;
}