// editor4
#include<iostream>
using namespace std;
int main(){
    string username;
    int age;
    cin>>username;
    cin>>age;
    if(username.length()<3){
        cout<<"Invalid username"<<endl;
    }
    else if(age<18 || age>100){
        cout<<"Invalid age"<<endl;
    }
    else{
        cout<<"Registration successful"<<endl;
    
    return 0;
}