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: ['4859', 'F', 'C', 'j', '2079', 'o', 'e', 'n', '8985', '5299', 'F', '183', '8183', '1141', '1421', '7575', 'j']

4859, 6, 3, 10, 2079, 15, 5, 14, 8985, 5299, 6, 183, 8183, 1141, 1421, 7575, 10