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: ['Z', 'X', '8875', '7505', '9881', '8981', '3481', 'G', '4883', 'W', 'g', '4557']

26, 24, 8875, 7505, 9881, 8981, 3481, 7, 4883, 23, 7, 4557