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: ['m', '6253', '9305', 'N', 'r', '5439', 'g', '5699', '4907', '3567', '4561', 'h', 'j', 'I', 'J', 't', '773', '8029', '8315', 'V', '6843', '2869', 'R', 'I', '6405']

13, 6253, 9305, 14, 18, 5439, 7, 5699, 4907, 3567, 4561, 8, 10, 9, 10, 20, 773, 8029, 8315, 22, 6843, 2869, 18, 9, 6405