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', 'i', '1911', 'b', 'J', 'k', '7681', 'Q', '6459', '8729', '1917', '9405', 'E', '4701', 'T', '3929', '2479', 'U', '1613', '4159', 'a', 't', '2919', '8083', '4463', 'h', '3887', 'i']

10, 9, 1911, 2, 10, 11, 7681, 17, 6459, 8729, 1917, 9405, 5, 4701, 20, 3929, 2479, 21, 1613, 4159, 1, 20, 2919, 8083, 4463, 8, 3887, 9