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: ['Y', 'k', '1847', '7437', 'c', 'd', '787', 'n', '2499', '6029', 'r', '6753', '5753', '7367', 'y', '6591', '8099', 'q', '2859', 't', 'z', '9591', '7761', '4191', '3707', '8701', '6893', '8461', '2879', 'u', 'Y', 'Q', '4649', 'A', '9293', '2453', 'I', 'P', '7209', '5379']

25, 11, 1847, 7437, 3, 4, 787, 14, 2499, 6029, 18, 6753, 5753, 7367, 25, 6591, 8099, 17, 2859, 20, 26, 9591, 7761, 4191, 3707, 8701, 6893, 8461, 2879, 21, 25, 17, 4649, 1, 9293, 2453, 9, 16, 7209, 5379