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: ['7723', '2369', '9665', 'p', 'h', '2853', '1741', '5601', 'J', 'a', 't', 'm', 'l', 'U', 'O', '2997', '8037', '8135', 'M', '9911', 'r', '6889', '2459', '4773', 'K', 'k', '6511', 't', '277', 'k', 'b', '1129', '8217']

7723, 2369, 9665, 16, 8, 2853, 1741, 5601, 10, 1, 20, 13, 12, 21, 15, 2997, 8037, 8135, 13, 9911, 18, 6889, 2459, 4773, 11, 11, 6511, 20, 277, 11, 2, 1129, 8217