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', 'g', '7015', '4009', '6469', 'C', '3051', 'g', 'm', 'Y', 'h', '3193', '4633', '7139', '4541', 'H', '9707', '9619', '1439', '6841', '5715', 'r', '7671', 'j', '5887', 'S', '7991', '759', '2049', '5857', 'a']

11, 7, 7015, 4009, 6469, 3, 3051, 7, 13, 25, 8, 3193, 4633, 7139, 4541, 8, 9707, 9619, 1439, 6841, 5715, 18, 7671, 10, 5887, 19, 7991, 759, 2049, 5857, 1