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: ['L', 'y', '9401', 'T', '6987', '4023', 'x', '3941', '8571', '509', '9621', '6151', 'a', 'X', '45', 'q', 'E', '2531', '4513', 'm', '57', '6449', '4851', 'r', 'V', '2587']

12, 25, 9401, 20, 6987, 4023, 24, 3941, 8571, 509, 9621, 6151, 1, 24, 45, 17, 5, 2531, 4513, 13, 57, 6449, 4851, 18, 22, 2587