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.

['O', '9965', '3005', '2667', 'f', 'c', '8921', 'x', '437', '2235', '9409', '3749', '3057', 'V', '3207', 'R', 'q', 's', 'A', '2895', '853', 'V', '7899', 'v', '3833', '4657', '6443', '1769', 'z', 'x', '6673', '69', 'E', 'F', 's', '2053']
15, 9965, 3005, 2667, 6, 3, 8921, 24, 437, 2235, 9409, 3749, 3057, 22, 3207, 18, 17, 19, 1, 2895, 853, 22, 7899, 22, 3833, 4657, 6443, 1769, 26, 24, 6673, 69, 5, 6, 19, 2053