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: ['r', 'z', '8645', '9053', '3629', '7689', '4465', '5281', 'Y', 'B']

18, 26, 8645, 9053, 3629, 7689, 4465, 5281, 25, 2