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: ['8623', '1535', '2699', 'e', '1463', '279']

8623, 1535, 2699, 5, 1463, 279