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