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