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