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: ['99', '7849', '379', '255', 'y', 'J', 'L', '8891', '2379', 'z', '6577', 'C', 'I', 'I', 'G', '3519', 'P', '8335', '2757', 'R', 'D', '3141', 'A', 'T', '6167', 'V', '9183', '9299', 'l', '8489', 'C', '8697', '6415', 'V', 'e', 'B', '1971']

99, 7849, 379, 255, 25, 10, 12, 8891, 2379, 26, 6577, 3, 9, 9, 7, 3519, 16, 8335, 2757, 18, 4, 3141, 1, 20, 6167, 22, 9183, 9299, 12, 8489, 3, 8697, 6415, 22, 5, 2, 1971