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: ['f', '7783', '1429', '3137', 'O', '4863', 'X', '9875', 'i', 'z', '8897', 'd', '3169', 'M', 'Q', '4245', 'U', 'z', '7535', 'r', 'f', '9073', '8085', '5515', '5173', 'Y', '6985', 'J', 'x', '6023']

6, 7783, 1429, 3137, 15, 4863, 24, 9875, 9, 26, 8897, 4, 3169, 13, 17, 4245, 21, 26, 7535, 18, 6, 9073, 8085, 5515, 5173, 25, 6985, 10, 24, 6023