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: ['4959', '2633', '5835', 'j', 'b', '1669', '2299', '1809', '1953', 'E', 'i', 'j', '2269', 's', 'D', 'r', '7735', '5507', 'J', 'u', 'k', 'E', 'l', 'e', '4499', '6597', 'M', 'P', 'X', '9483']

4959, 2633, 5835, 10, 2, 1669, 2299, 1809, 1953, 5, 9, 10, 2269, 19, 4, 18, 7735, 5507, 10, 21, 11, 5, 12, 5, 4499, 6597, 13, 16, 24, 9483