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: ['2487', 'E', '4559', 's', 'v', 'k', 'e', '5643', 'V', 'V', 'F', 'o', '2455', 'W', '1393', '6395', 'E', '2185', 'z', 'b', '2659', 'n', 'C', 'n', '7943', 'n']

2487, 5, 4559, 19, 22, 11, 5, 5643, 22, 22, 6, 15, 2455, 23, 1393, 6395, 5, 2185, 26, 2, 2659, 14, 3, 14, 7943, 14