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: ['t', 'B', '8075', 'K', '9055', 'd', '4033', '7837', '5829', 'l', 'M', 'P', 'N', '7819', 'l', 'w', 'X', 'f', 'B', '91', '7947']

20, 2, 8075, 11, 9055, 4, 4033, 7837, 5829, 12, 13, 16, 14, 7819, 12, 23, 24, 6, 2, 91, 7947