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: ['4273', '4245', 'T', 'd', '6237', 'W', '9839', '8677', 'a', '7147', '1611', '9881', '8353', 'g', '5263', 'g', 'D', '3833', '3333', '4479', 'g', 'Q', 'i', '1213', '5847']

4273, 4245, 20, 4, 6237, 23, 9839, 8677, 1, 7147, 1611, 9881, 8353, 7, 5263, 7, 4, 3833, 3333, 4479, 7, 17, 9, 1213, 5847