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: ['c', 'b', '1649', 'N', 'm', '6383', 'n', 'A', '8471', '7697', '2093', 'A', '6007', 'S']

3, 2, 1649, 14, 13, 6383, 14, 1, 8471, 7697, 2093, 1, 6007, 19