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: ['y', 'B', '9701', 'O', '5183', '7875', 'a', '9387', 'F', '9179', 'B', 'A', 'N', 'y', '3573', '4229']

25, 2, 9701, 15, 5183, 7875, 1, 9387, 6, 9179, 2, 1, 14, 25, 3573, 4229