digits = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]
print(len(digits))

letters = ["a", "b", "c", "d"]
print(letters, len("abcd"))

mixed_list = [1, 3.14159, "Spring", "Summer", [1, 2, 3, 4]]
print(mixed_list)