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: ['i', '3277', '4871', '5291', '2035', '2739', 'J', 'A', '7951', 'm', 'P', '5465', 'A', 'i', '1069', '3909', '4507', 'J', 'f', '5735']

9, 3277, 4871, 5291, 2035, 2739, 10, 1, 7951, 13, 16, 5465, 1, 9, 1069, 3909, 4507, 10, 6, 5735