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: ['x', 'R', '8841', 'j', '4461', '1515', 'w', 'A', '6575', '4411', '637', '6487', 'G', 'f', 'u', '3439', 'w']

24, 18, 8841, 10, 4461, 1515, 23, 1, 6575, 4411, 637, 6487, 7, 6, 21, 3439, 23