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: ['6523', 'R', '5585', '557', '1187', '7861', 'B', 'B', 'V', '9419', '4873', 'M', 'g', '8035', 'W', '8001', '7127', 'O', '3993', '4743', 'd', '9987', 'e', '9387']

6523, 18, 5585, 557, 1187, 7861, 2, 2, 22, 9419, 4873, 13, 7, 8035, 23, 8001, 7127, 15, 3993, 4743, 4, 9987, 5, 9387