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: ['9853', '3443', 'N', '7917', '8281', '5833', '3433', 'W', 'I', 'I', '9951', 'h', 'j', '5895', '6779', 'm', '8641', 'e', '8253', '8245', '9681', '1259', 'o', '9293', '445', 'r', '7213', '8703', '4787', 'c', '9551', 'L']

9853, 3443, 14, 7917, 8281, 5833, 3433, 23, 9, 9, 9951, 8, 10, 5895, 6779, 13, 8641, 5, 8253, 8245, 9681, 1259, 15, 9293, 445, 18, 7213, 8703, 4787, 3, 9551, 12