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: ['5467', 'e', 'o', '297', 't', 'A', 'f', 's', '5523', '8599', '5881']

5467, 5, 15, 297, 20, 1, 6, 19, 5523, 8599, 5881