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Library Book Management with Classes

Kotlin Medium classes

Task «Library Book Management with Classes»

Create a class `Book` with fields `title`, `author`, and `year`. Implement a class `Library` that stores a list of books and provides methods `addBook(book: Book)` to add a book, `findBooksByAuthor(author: String): List<Book>` to find all books by a given author, and `getBooksAfterYear(year: Int): List<Book>` to get books published after the specified year. Input data: first, an integer N — the number of operations. Then N lines, each containing a command: `ADD <title> <author> <year>` — add a book; `FIND_AUTHOR <author>` — output the titles of books by this author, separated by commas, in the order they were added; `FIND_YEAR <year>` — output the titles of books published after the specified year, separated by commas, in the order they were added. If no books are found, output "Not found".

Input Format

Integer N (1 ≤ N ≤ 1000). Then N lines with commands.

Output Format

For each FIND_AUTHOR or FIND_YEAR command — a string with the result (book titles separated by commas) or "Not found".

Examples

Example 1

INPUT
3 ADD Мастер и Маргарита Булгаков 1967 ADD Собачье сердце Булгаков 1925 FIND_AUTHOR Булгаков
OUTPUT
Мастер и Маргарита, Собачье сердце

Example 2

INPUT
4 add TheHobbit J.R.R.Tolkien 1937 add TheLordOfTheRings J.R.R.Tolkien 1954 find J.R.R.Tolkien borrow TheHobbit
OUTPUT

Example 3

INPUT
4 ADD 1984 Оруэлл 1949 ADD Скотный двор Оруэлл 1945 FIND_YEAR 1946 FIND_AUTHOR Оруэлл
OUTPUT
1984 1984, Скотный двор
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