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: ['j', '819', '4963', 'x', '5401', 'K', 'Q', '8837', 'x', '2147', 'w', '9659', '1703', 'y', '8293', '391', '5367']

10, 819, 4963, 24, 5401, 11, 17, 8837, 24, 2147, 23, 9659, 1703, 25, 8293, 391, 5367