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: ['3647', 'D', 'N', '3647', 'E', '2297', 'P', '8441', 'X']

3647, 4, 14, 3647, 5, 2297, 16, 8441, 24