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: ['4675', '8289', '8547', '7749', '1629', '4739', 'c', '6469', '6695', 'I', '8855', '2853', '5837', '7273', 'y', 'U', 'h', '9513', 'Q', '2041', 't']

4675, 8289, 8547, 7749, 1629, 4739, 3, 6469, 6695, 9, 8855, 2853, 5837, 7273, 25, 21, 8, 9513, 17, 2041, 20