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', 'h', 'w', '8115', '6409', 'm', 'F', 'B', 'l']

18, 8, 23, 8115, 6409, 13, 6, 2, 12