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: ['5591', '5529', '1363', 'W', '3151', '321', '9803', '9523']

5591, 5529, 1363, 23, 3151, 321, 9803, 9523