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: ['5463', 'e', '9139', '5959', '7979', '6519', '7771', '51', 'x', '9617', '5867', '7459', 'W', 'B', 'e', '7713', '9803', 'M', 'H', 'z', '1891', '5813', '3917', '7097', '6823', '5881', 'N', 'M', '2557', '443', '7797', 'L']

5463, 5, 9139, 5959, 7979, 6519, 7771, 51, 24, 9617, 5867, 7459, 23, 2, 5, 7713, 9803, 13, 8, 26, 1891, 5813, 3917, 7097, 6823, 5881, 14, 13, 2557, 443, 7797, 12