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: ['U', 'o', 'U', 'm', '8017', '5069', '829', 'U', 'o', 'y', 'j', '3835', 'C', 'O', 'd', 'X', '7723', 'A', '7203', 'c', '5287', '7249', '8275', '9227', '8553', 'R', '7677', '1609', '1751', 'r', '7593', 'k', '3777', 'o', 'd', 'G', 'I', '6765']

21, 15, 21, 13, 8017, 5069, 829, 21, 15, 25, 10, 3835, 3, 15, 4, 24, 7723, 1, 7203, 3, 5287, 7249, 8275, 9227, 8553, 18, 7677, 1609, 1751, 18, 7593, 11, 3777, 15, 4, 7, 9, 6765