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