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', 'Y', '7755', 'Q', '7517', 'o', 'r', 'l', '829', 'G', '1227', '1671', '7139', '8301', '2941', '9243', 'w', 'P', '3393', 'U', 'b', '5557', 'r', 'h', '9747']

16, 25, 7755, 17, 7517, 15, 18, 12, 829, 7, 1227, 1671, 7139, 8301, 2941, 9243, 23, 16, 3393, 21, 2, 5557, 18, 8, 9747