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: ['E', '4541', 'I', '6989', '8561', 'T', 'U', '9597', 'S', '8875', 'x', '9109', 'b', 'r', '1001', 'o', 'A', 'F', 'I', '2867', '2283', 'n', '9555']

5, 4541, 9, 6989, 8561, 20, 21, 9597, 19, 8875, 24, 9109, 2, 18, 1001, 15, 1, 6, 9, 2867, 2283, 14, 9555