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: ['j', '7651', 'R', 'U', 'd', 'w', '1323', '4833', 'W', '8737', '3073', 'l', 'W', '9037', '1267', '7489', '6273', '9017', '3577', '4865', '9043', 'U', '6519', 'p', '7449']

10, 7651, 18, 21, 4, 23, 1323, 4833, 23, 8737, 3073, 12, 23, 9037, 1267, 7489, 6273, 9017, 3577, 4865, 9043, 21, 6519, 16, 7449