def common_list(list1, list2):
    result = []
    for number in a_set:
        for number2 in b_set:
            if number == number2 :
                list3.append(number)
    return list3

a = [1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89]
b = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13]
print(common_list(a,b))