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: ['z', '4879', '1843', 'L', 'K', 'k', 'N', 'w', 'y', 'D', 'X', '5645', '5615', '8041', 'O', 'R', '6889', '9079', 'u', '3239', '8213', '1147', 'S', '9463', 'J', 'Y', 'X', '1081', 'u', '6983', '9753', 'Y', '3849', 'F', 'i']

26, 4879, 1843, 12, 11, 11, 14, 23, 25, 4, 24, 5645, 5615, 8041, 15, 18, 6889, 9079, 21, 3239, 8213, 1147, 19, 9463, 10, 25, 24, 1081, 21, 6983, 9753, 25, 3849, 6, 9