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: ['5501', '8919', '2153', 'd', '1471', '9087', 'a']

5501, 8919, 2153, 4, 1471, 9087, 1