d = {'Alice': [50, 61, 66], 'Bob': [80, 61, 66], 'Candy': [88, 75, 90]}

keys = d.keys()

print(keys)

print(len(keys))

d = {'Alice': [50, 61, 66], 'Bob': [80, 61, 66], 'Candy': [88, 75, 90]}

num=0

for key in d.keys():

    num+=1

print(num)

d = {'Alice': [50, 61, 66], 'Bob': [80, 61, 66], 'Candy': [88, 75, 90]}

num=0

for key in d:

    num+=1

print(num)