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: ['w', '6387', '8897', 'M', 'F', 'G', 'U', 'T', '1943', '6571', '5147']

23, 6387, 8897, 13, 6, 7, 21, 20, 1943, 6571, 5147