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: ['9439', 'r', '6303', '4093', '6895', 'y', '9207', 'S', '9493', 'l', '2655', 'N', '7017', '2187', '7513', '3557', 'h', 'e', '5127', '63', '1051', '7315', '2537', 'M', 'O', '5729', 'r', '2227', '971', 'O', 'g', 'Z', '7031']

9439, 18, 6303, 4093, 6895, 25, 9207, 19, 9493, 12, 2655, 14, 7017, 2187, 7513, 3557, 8, 5, 5127, 63, 1051, 7315, 2537, 13, 15, 5729, 18, 2227, 971, 15, 7, 26, 7031