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: ['K', '7043', 'H', 't', '7593', 'E', 'O', '157', '9209', 'Y', 'S', '6645', '1383', '2285', 'P', '6031', 'l', 'T', '2993', '5609', 'J', 's', 's', 'a', '933', '2681', 'u', 'Y', 'q', '1595', '5455', '9439', 'S']

11, 7043, 8, 20, 7593, 5, 15, 157, 9209, 25, 19, 6645, 1383, 2285, 16, 6031, 12, 20, 2993, 5609, 10, 19, 19, 1, 933, 2681, 21, 25, 17, 1595, 5455, 9439, 19