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: ['3641', 'g', '7275', '1497', '1173', '6347', 'a', '3553', 'p', '1093', 'a', '1617', '4739', 'Z', '9525', 'U', 'f', '4599', '9631', 'r', '73', '8971', 'S', 'v', 'x', 'K', '709', 'x']

3641, 7, 7275, 1497, 1173, 6347, 1, 3553, 16, 1093, 1, 1617, 4739, 26, 9525, 21, 6, 4599, 9631, 18, 73, 8971, 19, 22, 24, 11, 709, 24