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: ['S', 'J', '5461', '4995', '1441', '8523', 'H', '2983', '6675', 'z', 'X', 'g', 'i', 'V', '8725', 'k', 'W', 'j', '5315']

19, 10, 5461, 4995, 1441, 8523, 8, 2983, 6675, 26, 24, 7, 9, 22, 8725, 11, 23, 10, 5315