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: ['1813', '2355', 'c', 'J', '5557', 'u', '735', 'Z', '7985', 'l', 'd', '9209', 'D', '5769', 'W', '6269', '1791', 'y', 'a', 'T', 'u']

1813, 2355, 3, 10, 5557, 21, 735, 26, 7985, 12, 4, 9209, 4, 5769, 23, 6269, 1791, 25, 1, 20, 21