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: ['581', 'L', 'b', 'y', '4823', 'U', '6949', '9905', 'k', 's', '2183', 'G', '2439', '371', 'q']

581, 12, 2, 25, 4823, 21, 6949, 9905, 11, 19, 2183, 7, 2439, 371, 17