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: ['t', 'W', '5685', 'e', 'n', 'J', '3733', '6405', '6975', '5207', '1617', '5341', '7913', '1713', 'Y', '9291', '9015', '4245', '3151', '5311', 'd', '1069', 'A', '9037', '2217', '9377', 'z', 'U', 'k', '3177', 'p', '1909', '7539', 'b', '9463', '1813', '1471', '2571', '2857', '4361']

20, 23, 5685, 5, 14, 10, 3733, 6405, 6975, 5207, 1617, 5341, 7913, 1713, 25, 9291, 9015, 4245, 3151, 5311, 4, 1069, 1, 9037, 2217, 9377, 26, 21, 11, 3177, 16, 1909, 7539, 2, 9463, 1813, 1471, 2571, 2857, 4361