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: ['3421', 'U', '4971', 'C', 'F', '7237', '5037', '4341', '7553', 'j', '8659', 'y', '8805', 'E', '8883', '609', '8317', 'x', '2445', 'O', '881', 'w', 'G', 'n', 'G', '6377', '6183', 'q', 'F', '2983', '3213', 'X', 'z', '5693', '6881', '1875', 'g']

3421, 21, 4971, 3, 6, 7237, 5037, 4341, 7553, 10, 8659, 25, 8805, 5, 8883, 609, 8317, 24, 2445, 15, 881, 23, 7, 14, 7, 6377, 6183, 17, 6, 2983, 3213, 24, 26, 5693, 6881, 1875, 7