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: ['7891', '6813', '4625', '6601', 'y', '2657', '2283', '1285', '1461', 'g', 'n', 'h', '5803', 'O', 'A', 'd', 'H']

7891, 6813, 4625, 6601, 25, 2657, 2283, 1285, 1461, 7, 14, 8, 5803, 15, 1, 4, 8