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: ['H', '4973', '335', 'R', '9595', '3393', 'J', '1233', 'm', 'W', '3359', 'n', '6893', '3799', 'n', 'g', '3361', 'y', '1921', 'y', 'P', '1333', '5285', '9637', '787', '5315', '2265']

8, 4973, 335, 18, 9595, 3393, 10, 1233, 13, 23, 3359, 14, 6893, 3799, 14, 7, 3361, 25, 1921, 25, 16, 1333, 5285, 9637, 787, 5315, 2265