#include<iopstream>
#include<string>
using namespace std;
int main(){
    string username;
    int age;
    getline(cin, username);
    cin>> age;
    try{
        if(username.length()<3){
            throw"Invalid username";
        }
        if(age<18 || age > 100){
            throw"Invalid age";
        }
        cout<<"Registration successful";
    }
    catch(const char* msg){
        cout<<msg;
    }
    return 0;
}