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: ['4021', 'Q', 'M', 'T', 'V', '3091', '9815', 'i', 'B', '5711', '6751', 'p', 'X', '4303', '2957', 'D', '9065', '8697', '8919', '1603', 'F', 'A', '4623', 'F', '5813', 'n', 'x', '7937', 'j', 'q', '3643', 'N', 'H', '4373']

4021, 17, 13, 20, 22, 3091, 9815, 9, 2, 5711, 6751, 16, 24, 4303, 2957, 4, 9065, 8697, 8919, 1603, 6, 1, 4623, 6, 5813, 14, 24, 7937, 10, 17, 3643, 14, 8, 4373