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: ['n', '6157', 'A', 'r', 'P', 's', 'L', 'I', '3783', 'o', '7369', '9859', 'S', 'a', '8317', '1217', '9875', '165', '5359', '4977', '9793', 'G', '9371', 'q', 'b', '4739', '1499', 'm', '4747', 'I', '3261', 'M', '3141', 'a', '4849', '57']

14, 6157, 1, 18, 16, 19, 12, 9, 3783, 15, 7369, 9859, 19, 1, 8317, 1217, 9875, 165, 5359, 4977, 9793, 7, 9371, 17, 2, 4739, 1499, 13, 4747, 9, 3261, 13, 3141, 1, 4849, 57