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: ['9789', '1823', '7239', 'd', '2987', '8285', 'O', '6893', 'M', '5319', '7925', 'C', 'O', '4705', 'E', '5061', '839', 'T', 'm', '2479', 'J', '3173', '5687', '6651', 'z', '3785', 'W', 'l', 'G', 'q', 'X', '2861', '3297', 'v', 'M', '8191', '9813', '4187']

9789, 1823, 7239, 4, 2987, 8285, 15, 6893, 13, 5319, 7925, 3, 15, 4705, 5, 5061, 839, 20, 13, 2479, 10, 3173, 5687, 6651, 26, 3785, 23, 12, 7, 17, 24, 2861, 3297, 22, 13, 8191, 9813, 4187