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: ['7817', 's', 'x', 't', 'B', 'b', '5503', '7109', 'B', 'a', '9381', '2565', 'H', 'u', 'j', '6055', '5119', 'p', '4815', '5261', '6917', '447', '3531', '9567', '8283', 'Q', '9745', '8375', '9763', 'I', 'G', '47', 'v']

7817, 19, 24, 20, 2, 2, 5503, 7109, 2, 1, 9381, 2565, 8, 21, 10, 6055, 5119, 16, 4815, 5261, 6917, 447, 3531, 9567, 8283, 17, 9745, 8375, 9763, 9, 7, 47, 22