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: ['4387', '8243', 'm', 'S', 'p', 'Q', 'q', '8677', 'M', 'z', 'F', 'Z', '5345', 'G', '7943', '2791', '7765', 'D', 'U', '9535', 'K', '9173', '4833', '3041', '387', '8147', 'q', 'o', 'J', '609']

4387, 8243, 13, 19, 16, 17, 17, 8677, 13, 26, 6, 26, 5345, 7, 7943, 2791, 7765, 4, 21, 9535, 11, 9173, 4833, 3041, 387, 8147, 17, 15, 10, 609