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: ['Y', '7939', 'F', 'F', '1801', '195', 'r', '857', 'q', '3551', '9497', '389', 'E', '9875', 's', 'f', 'g', '7051', '3813', '443', '8673', 'K', 'F', 'k', 'P', '6689', 'u', '647', 'T', '8605', 'i', 'J', 'A']

25, 7939, 6, 6, 1801, 195, 18, 857, 17, 3551, 9497, 389, 5, 9875, 19, 6, 7, 7051, 3813, 443, 8673, 11, 6, 11, 16, 6689, 21, 647, 20, 8605, 9, 10, 1