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: ['F', 'F', '2459', '5561', 'k', '3499', '2867', '7147', '7997', 'T', '7095', '4993', '4087', '7167', '8351', 'f', 'c', 'y', '2919', '701', 'm', '7985', 'u', 'd']

6, 6, 2459, 5561, 11, 3499, 2867, 7147, 7997, 20, 7095, 4993, 4087, 7167, 8351, 6, 3, 25, 2919, 701, 13, 7985, 21, 4