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: ['3801', 'E', 'v', 's', '4891', '2037', 'v', '349', '2303', 'M', 'E', '7573', 'm', 'z', '8473', 'T', '5805', 'n', '157', '5323', 'x', '9715', 'R', '3389', 't', '4483', '9599', '729', '1077', '5419', 'i']

3801, 5, 22, 19, 4891, 2037, 22, 349, 2303, 13, 5, 7573, 13, 26, 8473, 20, 5805, 14, 157, 5323, 24, 9715, 18, 3389, 20, 4483, 9599, 729, 1077, 5419, 9