Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['4369', '9045', '8503', '6137', '9111', 'u', 'a', '6091', '6959', 'J', 'z', 'U', 'b', '4463', '1361', 'X', '2711', 'c', 'U', 'q', 'g', '2681', '9731', 'g', 'V', '6675', '7483', '6741', 'j', '4353', 'Z']

4369, 9045, 8503, 6137, 9111, 21, 1, 6091, 6959, 10, 26, 21, 2, 4463, 1361, 24, 2711, 3, 21, 17, 7, 2681, 9731, 7, 22, 6675, 7483, 6741, 10, 4353, 26