Strange, task 4 is no longer passing

# The dictionary will look something like:
# {'Andrew Chalkley': ['jQuery Basics', 'Node.js Basics'],
#  'Kenneth Love': ['Python Basics', 'Python Collections']}
#
# Each key will be a Teacher and the value will be a list of courses.
#
# Your code goes below here.
count_teachers = []

def num_teachers(teachers):
    for key in teachers:
        count_teachers.append(key)
    return len(count_teachers)

count_courses = []

def num_courses(teachers):
    values = teachers.values()
    count = 0
    for val in values:
        count += len(val)
    return count

courses_names = []
new_list = []

def courses(teachers):
    for k,v in teachers.items():
        courses_names.append(v)
    for list in courses_names:
        for item in list:
            new_list.append(item)
    return new_list

def most_courses(teachers):
    max_count = 0
    for k,v in teachers.items():
        if len(v) > max_count:
            max_count = len(v)
            max_teacher = k
        return k

final_list_teachers = []

def stats(teachers):
    for k,v in teachers.items():
        first_list = k,len(v)
        teacher = list(first_list)
        final_list_teachers.append(teacher)
    return final_list_teachers