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: ['B', 'Y', 'j', '3853', '2533', '6267', 'f', '2439', '6005', '6025', 'f', '1073']

2, 25, 10, 3853, 2533, 6267, 6, 2439, 6005, 6025, 6, 1073