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: ['P', '2225', '5771', 'D', '1685', 'Y', '9409', 'u', '205', 'x', 'N', 'b', '9841', 'd', 'j', '5733', '4883', '1021', '2407']

16, 2225, 5771, 4, 1685, 25, 9409, 21, 205, 24, 14, 2, 9841, 4, 10, 5733, 4883, 1021, 2407