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: ['4783', 'i', 'x', 'W', 'W', 'j', '6545', 'B', '9713', 'L', 'v', '1535', '4049', '7695', '653', 'G']

4783, 9, 24, 23, 23, 10, 6545, 2, 9713, 12, 22, 1535, 4049, 7695, 653, 7