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