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: ['4091', '7887', 'l', '7799', '8297', '1783', '5243', '3563', 'e', 'p', '7917', '7647', 'y', '2505', '389', '1317', 'M', 'G', '1751', 't', '3099', '7221', '9347', 't', 'u', '6769', '2587', '4613', '7297', 'r', '2051', '1763', '9327', '3165', 'p', '7703', '5005']

4091, 7887, 12, 7799, 8297, 1783, 5243, 3563, 5, 16, 7917, 7647, 25, 2505, 389, 1317, 13, 7, 1751, 20, 3099, 7221, 9347, 20, 21, 6769, 2587, 4613, 7297, 18, 2051, 1763, 9327, 3165, 16, 7703, 5005