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: ['3995', '8641', 'e', 'Q', 'y', 'n', 'N', '7917', 'S', 'T', 'T', 'T', '1287', 'J', 'n', 'T', 'r', '9699']

3995, 8641, 5, 17, 25, 14, 14, 7917, 19, 20, 20, 20, 1287, 10, 14, 20, 18, 9699