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: ['8711', '5633', 'o', 'H', '4699', 'b', 'p', '7829', '1769', 'K', 'n', '3391', 'm', '6577', '3517', 'y', 'T', 'F', 't', 'x', 'Z', 'v', 'O']

8711, 5633, 15, 8, 4699, 2, 16, 7829, 1769, 11, 14, 3391, 13, 6577, 3517, 25, 20, 6, 20, 24, 26, 22, 15