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: ['159', '5081', 'J', 'o', '1227', '973', '6077', '585', '1089', '8293', 's', '2815', 'd', '4701', '6541', '5451', '4049', '8169', '7681', '9711']

159, 5081, 10, 15, 1227, 973, 6077, 585, 1089, 8293, 19, 2815, 4, 4701, 6541, 5451, 4049, 8169, 7681, 9711