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: ['i', '4875', '1173', 'D', '3779', 'c', '2931', '5935', 'm', '6109', 'H', '7165', '3837', 'E', '6139', '1479', 'o', '8115', '7821', '1221', 'F', '5733', 'E']

9, 4875, 1173, 4, 3779, 3, 2931, 5935, 13, 6109, 8, 7165, 3837, 5, 6139, 1479, 15, 8115, 7821, 1221, 6, 5733, 5