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: ['2753', 'q', 'a', 'a', '739', 'I', 'D', '3441', '303', '5485', 'h', '3533', '5245', '1483', '4319', '399', '5187', 'u', 'b', 'i', '7675', '5911', 'm', '1311']

2753, 17, 1, 1, 739, 9, 4, 3441, 303, 5485, 8, 3533, 5245, 1483, 4319, 399, 5187, 21, 2, 9, 7675, 5911, 13, 1311