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: ['5933', 'S', 'U', 'n', '2751', '3505', '1793', '59', 'Z', 'g', '1939', '7895', 'V', '5985', '8051', 'a']

5933, 19, 21, 14, 2751, 3505, 1793, 59, 26, 7, 1939, 7895, 22, 5985, 8051, 1