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', 'C', '7357', 't', 'd', 'x', '2989', '253', '7441', 'a', '3209', 'D', 'x', 's', '339', '7849', 'x', '2909', 'F', '8473', 'O', '4827', '2029', 'G', '4001', 'J', '8235', 'e', '1375', 'o']

10, 3, 7357, 20, 4, 24, 2989, 253, 7441, 1, 3209, 4, 24, 19, 339, 7849, 24, 2909, 6, 8473, 15, 4827, 2029, 7, 4001, 10, 8235, 5, 1375, 15