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: ['4453', 'V', '2965', 'g', '1877', '7213', 'Y', '7457', 'N', 'H', 'U', 'r', 'p', '6373', '4815', 'F', '2003', 'f', 'B', 'f', 'f', 'B', 'b', '2953', '4153', 'Z', 'z', 'f', '8873', '5497', '9497']

4453, 22, 2965, 7, 1877, 7213, 25, 7457, 14, 8, 21, 18, 16, 6373, 4815, 6, 2003, 6, 2, 6, 6, 2, 2, 2953, 4153, 26, 26, 6, 8873, 5497, 9497