import java.util.ArrayList;
import java.util.Iterator;
import java.util.Scanner;


class Averaging {
	
	private static Scanner scanner = new Scanner(System.in);
	private static int pin = 0000;
	private static ArrayList<Integer> integer = new ArrayList<Integer>();
	
	
	private static int totalSum = 0;
	private static int entries = 0;
	
	public static void main(String[] args) {
		System.out.print("Welcome to the Averaging Program.");
		System.out.print("To verify you made this program, please enter a 4-digit pin: ");
		int passcode = scanner.nextInt();
		verify(passcode);
	}
	
	private static void verify(int pass) {
		if(pass == pin) {
			System.out.printf("Password accepted.\n\nI will be asking you to input values\n");
			loopInsert();
		}
	}
	
	private static void loopInsert() {
		for(int i = 0; i <= 25 ; i++) {
			System.out.print("Please insert a number, or to stop, type !stop.");
			String next = scanner.next();
			if(next == "!stop") {
				System.out.print("Good. I am currently calculating right now..");
				calculate();
			} else {
				integer.add(Integer.parseInt(next));
			}
		}
	}
	
	private static void calculate() {
		Iterator<Integer> iter = integer.iterator();
		while(iter.hasNext()) {
			entries++;
			totalSum += iter.next();
		}
		if(!iter.hasNext()) {
			int average = (totalSum/entries);
			System.out.printf("Your average is: " + average + ". I will show you what you have input.\n");
			System.out.print(integer.toString());
			System.out.print("To start a new session, please reboot me.");
		}
	}

}