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: ['S', '7181', 'S', 'x', '7567', '4099', 's', 'j', '4757', 'p', 'F', '4957', 'L', 'E', '5199', 'i', '4691', '7511', 'O', '1787', '149', '9249', 'x', 'p', '4903', '8233', '9461', 'w', 't', '563', '2435', '2341', 'D', 'J']

19, 7181, 19, 24, 7567, 4099, 19, 10, 4757, 16, 6, 4957, 12, 5, 5199, 9, 4691, 7511, 15, 1787, 149, 9249, 24, 16, 4903, 8233, 9461, 23, 20, 563, 2435, 2341, 4, 10