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: ['m', 'c', '2383', '3539', 'i', '2949', 'n', '9369', 'U', 'm', 'a', '6277', '5671', '4521', 'I', 'f', 'l', 'g', 'G', '629', 'l', '439', 'X', 'V', 'Y', 'P', '491']

13, 3, 2383, 3539, 9, 2949, 14, 9369, 21, 13, 1, 6277, 5671, 4521, 9, 6, 12, 7, 7, 629, 12, 439, 24, 22, 25, 16, 491