#include<iostream>
#include<string>
using namespace std;
class book
{
    private:
    string title;
    string author;
    public:
    book(string t,string a)
    {
        if(t.length()==0||t.length()>100)
        tile:"invalid";
        else
        title=t;
        if(a.length()==0||a.length()>100)
        author="Invalid";
        else
        author=a;
    }
    book(const book &b)
    {
        title =b.title;
        author=b.author;
    }
    void display()
    {
        cout<<"Title:"<<title<<end;
        cout<<"Author:"<<author<<endl;
    }
};
int main()
{
    string title,author;
    cin>>title>>author;
    book book(title,author);
    book book =book1;
}