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: ['9621', 'o', 'F', '2413', '333', '6201', 'X', '4397', 'H', 'x', 'e', '6853', '9977', 'E', '8331']

9621, 15, 6, 2413, 333, 6201, 24, 4397, 8, 24, 5, 6853, 9977, 5, 8331