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: ['9735', '623', 'D', '6531', 'K', '2739', 'N', '1399', 'g', 'z', 'z', 'F', '4983', '2575', '2545', '4341', '53', 'd', '4905', '5171']

9735, 623, 4, 6531, 11, 2739, 14, 1399, 7, 26, 26, 6, 4983, 2575, 2545, 4341, 53, 4, 4905, 5171