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: ['6515', 'H', '4165', 'B', 'i', 'l', '9491', '5155', '4875', '8473', '6913', 'K', '9341', 'C', 'h', '6265', 'J', 'r', 'B', '2833', '6093', 'l', '3843', 't', '8251', '3531', 'v', '369', '2159', '995', 'd', 'i', 'O', 'd', '6919', '5065', '277', 'E']

6515, 8, 4165, 2, 9, 12, 9491, 5155, 4875, 8473, 6913, 11, 9341, 3, 8, 6265, 10, 18, 2, 2833, 6093, 12, 3843, 20, 8251, 3531, 22, 369, 2159, 995, 4, 9, 15, 4, 6919, 5065, 277, 5