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: ['J', '4851', 'G', '4837', '259', '5003', 'A', '3813', 'u', '1907', 'l', '6739', 'X', '7399', '7001', '3355', '6583', 'a', '7125', 'H', '8769', '7987', 'x', 'S', '1737', 'a', '2043', '107', 'T', 'O', 'd', '5555', '5723', '6293', 'e', 'w']

10, 4851, 7, 4837, 259, 5003, 1, 3813, 21, 1907, 12, 6739, 24, 7399, 7001, 3355, 6583, 1, 7125, 8, 8769, 7987, 24, 19, 1737, 1, 2043, 107, 20, 15, 4, 5555, 5723, 6293, 5, 23