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: ['517', '3545', '71', 'x', '8097', '8495', '5583', 'S', 'e', '7649', '5293', 'U', 'k', 't', '4949']

517, 3545, 71, 24, 8097, 8495, 5583, 19, 5, 7649, 5293, 21, 11, 20, 4949