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: ['D', '9791', '335', 'V', '5817', 'B', '2221', 'H', '9701', 'U', 'U', '4833', '9211', 'y', '9461', '585', '8545', 'M', '9223', '441', '1923', '7429', 'a', '9215', '5565', 'd', 'S', 'O', 'B', 'k', '377', 'N']

4, 9791, 335, 22, 5817, 2, 2221, 8, 9701, 21, 21, 4833, 9211, 25, 9461, 585, 8545, 13, 9223, 441, 1923, 7429, 1, 9215, 5565, 4, 19, 15, 2, 11, 377, 14