#include<iostream>
#include<string>
using namespace std;

class Book {
    string title;
    string author;
    
    public:
    Book(string t,string a) {
        title=t;
        author=a;
    }
    Book(const book &b) {
        title=b.title;
        author=b.author;
    }
    void display() {
        cout<,"Title: "<<title<<endl;cout<<"author: "<<endl
    }
};
int main() {
    string title,author;
    cin>>title>>author;
    if(title.length()==0||title.length()>100|| author.length()==0||author.length().100{
        cout<<"Invalid input";
        return 0;
    }
    Book b1(title,author);
    Book b2=b1;
    return 0;
}