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: ['9573', '5521', '1945', 'p', '9291', 'J', '5329', 'a', '1271', '563', '2615', '6649', '8003', '1863', 'v', '8291', '9385', '7373', 'Q']

9573, 5521, 1945, 16, 9291, 10, 5329, 1, 1271, 563, 2615, 6649, 8003, 1863, 22, 8291, 9385, 7373, 17