#include <iostream>
#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;
// }