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: ['r', 'u', '5903', '8935', '487', 'I', '7395', 'l', '807', 'w', '3155', '9939', 't', 'X', '8511', '227', '1583', '5539', '2565', 'V', 'T', 'D', 'p', 'R', 'V', '8423', 'k', '9403', 'L', '5971', 'C', 't', 'e', 'N', '8001', 'D', 'v', '2975']

18, 21, 5903, 8935, 487, 9, 7395, 12, 807, 23, 3155, 9939, 20, 24, 8511, 227, 1583, 5539, 2565, 22, 20, 4, 16, 18, 22, 8423, 11, 9403, 12, 5971, 3, 20, 5, 14, 8001, 4, 22, 2975