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: ['H', 'a', 'n', 'k', 'V', '6515', 'b', 'W', '685', 'f', 'r', '4421', 'T', 'd', '1487', 'S', 'z', '1619', 'd', 'Q', '8383', '3293', '5879', 'L', '1595', 'S', 'X', '933', '3559', '381']

8, 1, 14, 11, 22, 6515, 2, 23, 685, 6, 18, 4421, 20, 4, 1487, 19, 26, 1619, 4, 17, 8383, 3293, 5879, 12, 1595, 19, 24, 933, 3559, 381