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: ['2863', '4197', 'U', '2803', '7323', '8805', 'n', 'F', 'k', 'I', '2135', 'w', '9539', 'L', 'A', '5881', '8563', '5031', 'k', '7511', '4065', 'z', '4789', '1045', 'r', 'W', 'b', '2379', '6377', '8699', 'K', '9055', 'r', '777', '4067', 'X', 'e']

2863, 4197, 21, 2803, 7323, 8805, 14, 6, 11, 9, 2135, 23, 9539, 12, 1, 5881, 8563, 5031, 11, 7511, 4065, 26, 4789, 1045, 18, 23, 2, 2379, 6377, 8699, 11, 9055, 18, 777, 4067, 24, 5