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: ['7537', 'X', 'L', '5455', 'G', '8569', '9181', 'e', 'A', '7871', 'H', '4867', '6663', 'Y', 'A', 'r', '9565', '3275', 'g', '3639', '4959', 'H', '5439', '3867', 'k', 'm', '7155', '5557', '8273', '2385', '3541', '6433', '3671', '5645', 'L', 'h', 't', '8469', 'y', '8931']

7537, 24, 12, 5455, 7, 8569, 9181, 5, 1, 7871, 8, 4867, 6663, 25, 1, 18, 9565, 3275, 7, 3639, 4959, 8, 5439, 3867, 11, 13, 7155, 5557, 8273, 2385, 3541, 6433, 3671, 5645, 12, 8, 20, 8469, 25, 8931