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', '8241', '1327', '5611', '4793', 'U', '4503', 'D', 'S', '2061', '5585', 'E', '6877', '9915', 'o', 'W', 's', '2731', 'i', 'R', '4779', '2893', 'q', 'H', 'n', 'Y']

12, 8241, 1327, 5611, 4793, 21, 4503, 4, 19, 2061, 5585, 5, 6877, 9915, 15, 23, 19, 2731, 9, 18, 4779, 2893, 17, 8, 14, 25