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: ['K', 'U', 'N', 'k', 'U', '1883', 'D', 'C', 'R', 'i', 'b', 'r', '5987', '7867', '2245', '2255', '5389', '3705', 'F', '3207', 'M', '1269', '2725', '8671', 'K', '1659', 'q']

11, 21, 14, 11, 21, 1883, 4, 3, 18, 9, 2, 18, 5987, 7867, 2245, 2255, 5389, 3705, 6, 3207, 13, 1269, 2725, 8671, 11, 1659, 17