a = [11, 22, 33]

print(a)  # [11, 22, 33]

a.append(99)

print(a)  # [11, 22, 33, 99]

a.pop(1)

print(a)  # [11, 33, 99]

a.insert(2, 88)

print(a)  # [11, 33, 88, 99]