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: ['5435', 'J', 'D', 'g', '1453', '8853', '427', '5069', 'N', '4807', '2011', 'g', 'G', 'y', '1419', 'S', 'v', '775', 'o', 'a', 'p', 'X', 'U', '9773']

5435, 10, 4, 7, 1453, 8853, 427, 5069, 14, 4807, 2011, 7, 7, 25, 1419, 19, 22, 775, 15, 1, 16, 24, 21, 9773