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: ['L', 'W', '5619', 'x', '1953', 'p', '1069', 'Z', 'Y', '4747', 'y', 'G', 'J', 'D', 'k', 'L', 'R', 'K', '5097', '7755', '3853', '4709', 'z', '7375', '8209', '29', 'k', '1277', 'U', 'N', 'p', '5711', '8175']

12, 23, 5619, 24, 1953, 16, 1069, 26, 25, 4747, 25, 7, 10, 4, 11, 12, 18, 11, 5097, 7755, 3853, 4709, 26, 7375, 8209, 29, 11, 1277, 21, 14, 16, 5711, 8175