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: ['P', '8619', '2645', 'h', '7713', '6963', 'E', 'S', 'z', 'i', 'F', 'X', '3973', '6097', 'C', '4213', '2315', 'd', '9455', '2081', 's', '3947']

16, 8619, 2645, 8, 7713, 6963, 5, 19, 26, 9, 6, 24, 3973, 6097, 3, 4213, 2315, 4, 9455, 2081, 19, 3947