a = [10, 20, 30, 40, 50]
a.pop(2)
a.pop()
print(a)

b = [1, 1, 3, 1, 2, 1]
print(b.count(1))

c = "i like python"
print(c.split(" "))

d = ['cookie', 'coffee', 'milk']
print(", ".join(d))