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: ['L', '9727', '9555', '3175', 'f', 'B', '9863', 'F', 'P', '5269', '7065', '4223', 'c', 'F']

12, 9727, 9555, 3175, 6, 2, 9863, 6, 16, 5269, 7065, 4223, 3, 6