train the trainers

number_of_jury = int(input())
number_of_presentation = 0
total_grades_all_presentation = 0
grade_count = 0
command = input()
while command != 'Finish':
    presentation = command
    number_of_presentation += 1
    total_grades = 0
    for each_jury in range(number_of_jury):
        grade = float(input())
        total_grades += grade
        grade_count += 1
    average = total_grades / number_of_jury
    print(f"{presentation} - {average:.2f}.")
    total_grades_all_presentation += total_grades
    command = input()

average_all_presentation = total_grades_all_presentation / grade_count
print(f"Student's final assessment is {average_all_presentation:.2f}.")