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: ['G', 'o', '25', '9353', '3211', '7913', 'W', 'F', '2479', 'Y', '1911', 'J', 'g', '5269', '8811', 'G', 'Z', '2755', 'Y', '4485', '9887', 'J', 'H', '1239']

7, 15, 25, 9353, 3211, 7913, 23, 6, 2479, 25, 1911, 10, 7, 5269, 8811, 7, 26, 2755, 25, 4485, 9887, 10, 8, 1239