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: ['W', '6663', 'H', 'o', '1465', 'l', '1571', '1043', 'V', 'L', '5735', 'V', '2251', 'p', '1679', 'T', '689', 'o', 'B', 'n', '7645', '7931', '7115', 'r', '429', 't', '3703', '527', 'F', 'l', 'q', '449', '2415', 'E', 'l']

23, 6663, 8, 15, 1465, 12, 1571, 1043, 22, 12, 5735, 22, 2251, 16, 1679, 20, 689, 15, 2, 14, 7645, 7931, 7115, 18, 429, 20, 3703, 527, 6, 12, 17, 449, 2415, 5, 12