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: ['5911', 'M', 'o', 'H', '2925', '8751', '8641', 'X', '4285', '3253', '9589', 'A', 'I', 'j', 'k', 'D', 'C', 'a', '8693', 'N', 'F', 'U', 'B', '2095', 'X', 'D', 'B', '8219', '5365', 'C', '381', '7885', 'F', '4213', 'J', '943', 'u', 'E']

5911, 13, 15, 8, 2925, 8751, 8641, 24, 4285, 3253, 9589, 1, 9, 10, 11, 4, 3, 1, 8693, 14, 6, 21, 2, 2095, 24, 4, 2, 8219, 5365, 3, 381, 7885, 6, 4213, 10, 943, 21, 5