11_course_planning

def is_valid(lst, idx):
    return 0 <= idx < len(lst)


def add_lesson(list_of_lessons, title):
    if title not in list_of_lessons:
        list_of_lessons.append(title)
    return list_of_lessons


def insert_lesson_title(list_of_lessons, title, idx):
    if is_valid(list_of_lessons, idx):
        if title not in list_of_lessons:
            list_of_lessons.insert(idx, title)
    return list_of_lessons


def remove(list_of_lessons, title):
    if title in list_of_lessons:
        list_of_lessons.remove(title)
        lesson_exercise = f'{title}-Exercise'
        if lesson_exercise in list_of_lessons:
            list_of_lessons.remove(title)
    return list_of_lessons


def swap(list_of_lessons, title1, title2):
    if title1 in list_of_lessons and title2 in list_of_lessons:
        first_lesson_index = list_of_lessons.index(title1)
        second_lesson_index = list_of_lessons.index(title2)
        # Swap the lessons
        list_of_lessons[first_lesson_index], list_of_lessons[second_lesson_index] = \
            list_of_lessons[second_lesson_index], list_of_lessons[first_lesson_index]
        first_lesson_exercise = f'{title1}-Exercise'
        second_lesson_exercise = f'{title2}-Exercise'

        if first_lesson_exercise in list_of_lessons:
            list_of_lessons.remove(first_lesson_exercise)
            if second_lesson_index + 1 == len(list_of_lessons):
                list_of_lessons.append(first_lesson_exercise)
            else:
                list_of_lessons.insert(second_lesson_index + 1, first_lesson_exercise)

        if second_lesson_exercise in list_of_lessons:
            list_of_lessons.remove(second_lesson_exercise)
            if first_lesson_index + 1 == len(list_of_lessons):
                list_of_lessons.append(second_lesson_exercise)
            else:
                list_of_lessons.insert(first_lesson_index + 1, second_lesson_exercise)

    return list_of_lessons


def exercise(list_of_lessons, title):
    if title not in list_of_lessons:
        list_of_lessons.append(title)
        lesson_exercise = f'{title}-Exercise'
        lesson_title_index = list_of_lessons.index(title)

        if lesson_title_index + 1 < len(list_of_lessons):
            list_of_lessons.insert(lesson_title_index + 1, lesson_exercise)
        else:
            list_of_lessons.append(lesson_exercise)

    else:
        lesson_title_index = list_of_lessons.index(title)
        lesson_exercise = f'{title}-Exercise'
        if lesson_exercise not in list_of_lessons:
            if lesson_title_index + 1 < len(list_of_lessons):
                list_of_lessons.insert(lesson_title_index + 1, lesson_exercise)
            else:
                list_of_lessons.append(lesson_exercise)

    return list_of_lessons


def course_planning(schedule):
    while True:
        command = input()
        if command == "course start":
            break

        info = command.split(":")
        action = info[0]

        if action == "Add":
            lesson_title_to_add = info[1]
            schedule = add_lesson(schedule, lesson_title_to_add)

        elif action == "Insert":
            lesson_title_to_insert, index_to_insert = info[1], int(info[2])
            schedule = insert_lesson_title(schedule, lesson_title_to_insert, index_to_insert)

        elif action == "Remove":
            lesson_title_to_remove = info[1]
            schedule = remove(schedule, lesson_title_to_remove)

        elif action == "Swap":
            lesson_title1, lesson_title2 = info[1], info[2]
            schedule = swap(schedule, lesson_title1, lesson_title2)

        elif action == "Exercise":
            lesson_title_exercise = info[1]
            schedule = exercise(schedule, lesson_title_exercise)

    return schedule


list_schedule = input().split(", ")
course_planning(list_schedule)
for index_, course in enumerate(list_schedule):
    print(f"{index_ + 1}.{course}")