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: ['621', '219', '2915', 'i', 'J', '2449', '7073', '5379', 's', '9773', 'e', '7813', 'D', 'q', '6559', 's', '7543', '4609', 'k', '2787', '9277', 'Z', '357', 'E', '1533', 'y', 'n', 'Q', 'C', '9011', '9665', '2371', '1281', '9045', '165', '723', '6487', '1583', '6509', '1473']

621, 219, 2915, 9, 10, 2449, 7073, 5379, 19, 9773, 5, 7813, 4, 17, 6559, 19, 7543, 4609, 11, 2787, 9277, 26, 357, 5, 1533, 25, 14, 17, 3, 9011, 9665, 2371, 1281, 9045, 165, 723, 6487, 1583, 6509, 1473