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: ['L', 'V', 'A', 'O', '8903', '2671', 'd', '8751', '6381', '5359']

12, 22, 1, 15, 8903, 2671, 4, 8751, 6381, 5359