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: ['4629', '9687', '5161', 'D', '8189', '1847', '5145', '9315', 'l', 'N', '9311', '3199']

4629, 9687, 5161, 4, 8189, 1847, 5145, 9315, 12, 14, 9311, 3199