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', 'A', '4071', '8151', '1359', 'N', '5445', 'q', '459', '8261', 'v', 'U', '2139', '8539', 'P', '5043', '5009', '5435', 'k', 'i', 'C', 't', '2133', '4927', 'n', '1855', '5505', '4921', '2871', '6005', '9567', 'O', 'E', '1743']

8, 1, 4071, 8151, 1359, 14, 5445, 17, 459, 8261, 22, 21, 2139, 8539, 16, 5043, 5009, 5435, 11, 9, 3, 20, 2133, 4927, 14, 1855, 5505, 4921, 2871, 6005, 9567, 15, 5, 1743