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: ['C', '3839', '7329', '1907', 'n', 'g', 'Y', '2257', 'v', 'S', 'C', 'g', '6301', '2721', '8887', 'm', '1861', 'a', '4989', '9977', 'm', 'k', 'h', 'T', '4953', '9177', '1359']

3, 3839, 7329, 1907, 14, 7, 25, 2257, 22, 19, 3, 7, 6301, 2721, 8887, 13, 1861, 1, 4989, 9977, 13, 11, 8, 20, 4953, 9177, 1359