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: ['P', 'h', 'I', '3575', 'z', 'c', '4175', '3807', 'g', '2461', '2599', 'K', 'X', '3907', '7203', '4533', '5291', '6971', 'b', 'x', 'Z', '8347', 'p', 'c', '3453', '8363', '6869', 'a', '5365', '4329', '4029', 'F', 's', '4383', 'O', '4335', '8375', '8897']

16, 8, 9, 3575, 26, 3, 4175, 3807, 7, 2461, 2599, 11, 24, 3907, 7203, 4533, 5291, 6971, 2, 24, 26, 8347, 16, 3, 3453, 8363, 6869, 1, 5365, 4329, 4029, 6, 19, 4383, 15, 4335, 8375, 8897