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', 'O', '8931', 'O', '887', 'n', '4103', '5991', '9925', '6213', '9739', '5767', 'r', 'x', 'v', 'M', 'S', '3303', '4583', '3347', '9277', '899', '9321']

14, 15, 8931, 15, 887, 14, 4103, 5991, 9925, 6213, 9739, 5767, 18, 24, 22, 13, 19, 3303, 4583, 3347, 9277, 899, 9321