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: ['7949', 'T', '1931', 'f', '8331', '1563', '3685', 'a', '2883', 'D', '1593', 'B']

7949, 20, 1931, 6, 8331, 1563, 3685, 1, 2883, 4, 1593, 2