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: ['I', '3347', '6483', '8983', '3557', 'T', 'V', 'H', '4155', 'l', '8001', 'n', 'C', '8395', '3865', 'J', 'f', 'p']

9, 3347, 6483, 8983, 3557, 20, 22, 8, 4155, 12, 8001, 14, 3, 8395, 3865, 10, 6, 16