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