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: ['l', 'f', 'k', '5253', 'z', 'Q', '5717', 'f', '4155', 'G', '2905', '9725', 'r', '8883', 'L', 'Q', '7155', '2511', '6065', 'h', '9913', '5023', '9129', '4281', '4971', '3437']

12, 6, 11, 5253, 26, 17, 5717, 6, 4155, 7, 2905, 9725, 18, 8883, 12, 17, 7155, 2511, 6065, 8, 9913, 5023, 9129, 4281, 4971, 3437