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: ['E', '4265', '3237', '1665', '6743', '6497', '2591', 'f', '7951', '7725', 'Y', '479', '6171', '5885']

5, 4265, 3237, 1665, 6743, 6497, 2591, 6, 7951, 7725, 25, 479, 6171, 5885