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: ['T', 'T', '8789', 'J', 'm', 'k', '4077', '7135', '173', 'x', '9835', 'E', '9571', '365', '1039', '8295', 'L']

20, 20, 8789, 10, 13, 11, 4077, 7135, 173, 24, 9835, 5, 9571, 365, 1039, 8295, 12