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# Start coding here... 
import datetime

class TimeManager:
    def __init__(self):
        self.current_time = datetime.datetime.now()

    def get_current_time(self):
        self.current_time = datetime.datetime.now()
        print("Current time:", self.current_time.strftime("%H:%M:%S"))

    def start_stopwatch(self):
        start_time = datetime.datetime.now()
        input("Press Enter to stop the stopwatch.")
        end_time = datetime.datetime.now()
        elapsed_time = end_time - start_time
        print("Elapsed time:", elapsed_time)

class Calendar:
    def __init__(self):
        self.appointments = {}

    def create_appointment(self, date, description):
        if date in self.appointments:
            self.appointments[date].append(description)
        else:
            self.appointments[date] = [description]

    def view_appointments(self, date):
        if date in self.appointments:
            print("Appointments for", date)
            for appointment in self.appointments[date]:
                print("-", appointment)
        else:
            print("No appointments for", date)

class ToDoList:
    def __init__(self):
        self.tasks = []

    def add_task(self, task):
        self.tasks.append(task)

    def remove_task(self, task):
        if task in self.tasks:
            self.tasks.remove(task)

    def view_tasks(self):
        print("To-Do List:")
        if self.tasks:
            for i, task in enumerate(self.tasks, 1):
                print(f"{i}. {task}")
        else:
            print("No tasks.")

class YearPlanner:
    def __init__(self):
        self.events = {}

    def add_event(self, month, day, event):
        key = f"{month}-{day}"
        if key in self.events:
            self.events[key].append(event)
        else:
            self.events[key] = [event]

    def view_events(self, month, day):
        key = f"{month}-{day}"
        if key in self.events:
            print("Events for", key)
            for event in self.events[key]:
                print("-", event)
        else:
            print("No events for", key)

def main():
    time_manager = TimeManager()
    calendar = Calendar()
    todo_list = ToDoList()
    year_planner = YearPlanner()

    while True:
        print("\nPhone Application")
        print("1. Time Management")
        print("2. Stopwatch")
        print("3. Calendar")
        print("4. To-Do List")
        print("5. Year Planner")
        print("0. Exit")

        choice = input("Enter your choice: ")

        if choice == "1":
            time_manager.get_current_time()

        elif choice == "2":
            time_manager.start_stopwatch()

        elif choice == "3":
            print("\nCalendar")
            print("1. Create Appointment")
            print("2. View Appointments")
            print("0. Back")

            calendar_choice = input("Enter your choice: ")

            if calendar_choice == "1":
                date = input("Enter date (YYYY-MM-DD): ")
                description = input("Enter appointment description: ")
                calendar.create_appointment(date, description)

            elif calendar_choice == "2":
                date = input("Enter date (YYYY-MM-DD): ")
                calendar.view_appointments(date)

            elif calendar_choice == "0":
                continue

        elif choice == "4":
            print("\nTo-Do List")
            print("1. Add Task")
            print("2. Remove Task")
            print("3. View Tasks")
            print("0. Back")

            todo