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: ['6901', '6741', '4771', 'W', 'd', '5501', '1905', '5553', '6101', '6187', 'h', 'b', 'Y', 'K', '8501']

6901, 6741, 4771, 23, 4, 5501, 1905, 5553, 6101, 6187, 8, 2, 25, 11, 8501