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: ['6481', '4111', '5593', 'L', '8385', '271', '4201', 'l', '5335', 'v', '5855', 'D', 'g', '1169', '2299', '29', 'B', 't', 'K', 'M', 'W', 'w', 'z', '2719', 'T', 'M', '6753', 'D', 'R', 'H', '6679', 'C', 'J', 'p', 'N', '3755']

6481, 4111, 5593, 12, 8385, 271, 4201, 12, 5335, 22, 5855, 4, 7, 1169, 2299, 29, 2, 20, 11, 13, 23, 23, 26, 2719, 20, 13, 6753, 4, 18, 8, 6679, 3, 10, 16, 14, 3755