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', 'c', '863', 'K', '761', 'T', 'G', 'J', 'a', '3085', '1685', '2665', 'c', '4873', 'n', 'y', 'P', '6699', '3331', '5609', '4695', 'K', '9837', '5955', '5975', 'c', '1963', '7681', '1739', 'U', 'R', '5191']

26, 3, 863, 11, 761, 20, 7, 10, 1, 3085, 1685, 2665, 3, 4873, 14, 25, 16, 6699, 3331, 5609, 4695, 11, 9837, 5955, 5975, 3, 1963, 7681, 1739, 21, 18, 5191