import java.awt.*;
import java.io.IOException;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.Date;
import java.util.Locale;
import java.util.Scanner;
import static java.lang.Math.*;
public class Main {


    public static void cwiczenia3_1() {


    }




    static void cwiczenie2_1() {
        System.out.println("Podaj datę urodzenia:");
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MMMM d, yyyy", Locale.ENGLISH);
        LocalDate date = LocalDate.parse(s, formatter);
        System.out.println(date);


    }

    static void zadanie1_1() {
        System.out.println("Zadanie 1");
        Scanner reader1 = new Scanner(System.in);
        System.out.println("Enter a name: ");
        String n1 = reader1.nextLine();
        System.out.println("Enter a surname: ");
        Scanner reader2 = new Scanner(System.in);
        String n2 = reader2.nextLine();
        System.out.println("Witaj" + n1 + " " + n2);
    }

    static void zadanie1_2() {
        System.out.println("Zadanie 2");
        System.out.println("Podaj 10 liczb dodatnich :");
        int i = 0;
        int maks = 0;
        int min = 1000000;
        int suma = 0;
        while (i < 10) {
            Scanner reader3 = new Scanner(System.in);
            int w = reader3.nextInt();
            maks = max(w, maks);
            min = min(w, min);
            suma += w;


            i++;
        }
        float srednia = suma / 10;
        System.out.println("Suma: " + suma);
        System.out.println("średnia: " + srednia);
        System.out.println("Maksimum: " + maks);
        System.out.println("Minimum: " + min);
    }

    static void zadanie1_3() {
        System.out.println("Zadanie 3");
        System.out.println("Podaj liczbę:");
        Scanner reader4 = new Scanner(System.in);
        float w1 = reader4.nextFloat();
        System.out.println("Podaj znak działania:");
        Scanner reader5 = new Scanner(System.in);
        char w2 = reader5.next().charAt(0);
        System.out.println("Podaj liczbę:");
        Scanner reader6 = new Scanner(System.in);
        float w3 = reader6.nextFloat();
        switch (w2) {
            case '+':
                float suma = w1 + w3;
                System.out.println(w1 + "\n" + w2 + "\n" + w3 + "\n" + suma);
                break;
            case '-':
                float roznica = w1 - w3;
                System.out.println(w1 + "\n" + w2 + "\n" + w3 + "\n" + roznica);
                break;
            case '*':
                float iloczyn = w1 * w3;
                System.out.println(w1 + "\n" + w2 + "\n" + w3 + "\n" + iloczyn);
                break;
            case '/':
                float iloraz = w1 / w3;
                System.out.println(w1 + "\n" + w2 + "\n" + w3 + "\n" + iloraz);
                break;
        }}

    static void cwiczenie1_7() throws IOException {

        char[] tablica = new char[30];

        char znak;
        int i = 0;
        do {
            znak = (char) System.in.read();
            tablica[i++] = znak;
        }
        while (znak != '\n' && i < 30);

        for (int j = 0; j < i; j++) {
            if (Character.isLetter(tablica[j]))
                System.out.print(tablica[j]);
        }
    }

        public static void main (String[]args){

            cwiczenie2_1();
            try {
                cwiczenie1_7();

            } catch (IOException e) {
                e.printStackTrace();
            }

            zadanie1_1();
            zadanie1_2();
            zadanie1_3();
//
//
//        int i;
//        double pl;
//        int n=0,N=0;
//        double x =0, y = 0;
//        System.out.println("Podaj znak działania:");
//        Scanner reader6 = new Scanner(System.in);
//        int liczba= reader6.nextInt();
//        Random generator = new Random();
//        for(i=0;i<liczba;i++)
//            {
//                x= generator.nextDouble();
//                y=generator.nextDouble();
//                if(x<=1 && x>=0 && y<=1 && y>=0){
//
//                }
//            }
//            pl=4*n/N;
//            g.drawString("PI~"+pl);
        }


    }