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: ['3917', 'M', 'W', 'q', '1647', '9159', 'O', '9147', '1773', 'U', '35', '6231', 'p', 'Y', '8481', '5773', '7943', '8721', 'h', 'L', '5975', '8379', '7459', '603', '3525', 'b', 'b', '1449', '7347', '2067', 'A', 't', 'j', 't', '2499', 'm']

3917, 13, 23, 17, 1647, 9159, 15, 9147, 1773, 21, 35, 6231, 16, 25, 8481, 5773, 7943, 8721, 8, 12, 5975, 8379, 7459, 603, 3525, 2, 2, 1449, 7347, 2067, 1, 20, 10, 20, 2499, 13