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: ['l', '7113', '5977', '559', 'P', 'c', 'V', 'P', 'H', 'p', '9681', '3799', '9213', 's', '1969', '5119', '3741', '817']

12, 7113, 5977, 559, 16, 3, 22, 16, 8, 16, 9681, 3799, 9213, 19, 1969, 5119, 3741, 817