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: ['5237', '3039', 'P', 'U', '5141', 'k', '9001', '7103', 'F', '4339', '9729', 'e', 'z', 'f', 'd', '2029', '123', 'N', 'b', '2893']

5237, 3039, 16, 21, 5141, 11, 9001, 7103, 6, 4339, 9729, 5, 26, 6, 4, 2029, 123, 14, 2, 2893