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: ['I', '5217', 'U', '2031', 'F', 'D', 'f', 'T', 'K', '8307', '3459', '3775', '7133', '787', '2335', '4689', '229', '3335', '7435', 'n', 'U', '5961', '6033', 'O', '4759', 'g', 'J', '2645', '435', 'x', 'n', '6929', 'q', '8483', 'h', '4159', 'K', 'q']

9, 5217, 21, 2031, 6, 4, 6, 20, 11, 8307, 3459, 3775, 7133, 787, 2335, 4689, 229, 3335, 7435, 14, 21, 5961, 6033, 15, 4759, 7, 10, 2645, 435, 24, 14, 6929, 17, 8483, 8, 4159, 11, 17