why it doesnt work ?
package pl.codegym.task.task08.task0828;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;
public class Solution {
public static void main(String[] args) throws IOException, ParseException {
ArrayList<Integer> lista = new ArrayList<>();
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String s = reader.readLine();
DateFormat format = new SimpleDateFormat("MMMM", Locale.ENGLISH);
Date date = format.parse(s);
int month = date.getMonth() + 1;
System.out.println(s + " to miesiąc nr " + month);
}
}