M = ['b' * x for x in range(4)]
print(M) a = set('abc')
b = set('cdef')
print(a & b) list1 = [1, 3]
list2 = list1
list1[0] = 4
print(list2) num = (4, 7, 19, 2, 89, 45, 72, 22)
y = sorted(num)
z = [x for x in y if x % 2 != 0]
print(z) print([i.lower() for i in 'HELLO'])