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: ['w', '3413', 'o', 'Q', '1', 'b', '4801', '1279', '8549', '4765', 'z', '8635', 'y', '241', 'f', '6961', 'X', 'i', 'U']

23, 3413, 15, 17, 1, 2, 4801, 1279, 8549, 4765, 26, 8635, 25, 241, 6, 6961, 24, 9, 21