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', 'R', 'H', '3989', '8699', 'v', '55', '8843', 'j', 'x', 't', '9923', 'F', 'G', 'b', 'a', '1577', 'c', '8685', '5173', '1199', 'h', '2639', '8359', 'P', 'f', 'K', 'X', 'R', '8037']

12, 18, 8, 3989, 8699, 22, 55, 8843, 10, 24, 20, 9923, 6, 7, 2, 1, 1577, 3, 8685, 5173, 1199, 8, 2639, 8359, 16, 6, 11, 24, 18, 8037