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: ['8269', '1311', 'F', '787', '7391', '2935', 'z', 'm', '6555', '3899', '3645', 's', 'F', 'm', 't', 't', 'k', 'f', '8597', 'u', '5183', 'm', 'K', 'T', '2013', '2919']

8269, 1311, 6, 787, 7391, 2935, 26, 13, 6555, 3899, 3645, 19, 6, 13, 20, 20, 11, 6, 8597, 21, 5183, 13, 11, 20, 2013, 2919