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: ['C', '7839', '1951', '9917', '5749', '4341', '7209', '8237', 'P', '6079', 'l', 'S', '6663', '4777', '6645', 'L', '2257', 'p', '9685', 'c', '3597', 'N', '8363', '3005', 'g', 'z', '5583', '9833', '1109', 'N', '8323', '6111', '4891', 'f', 'V']

3, 7839, 1951, 9917, 5749, 4341, 7209, 8237, 16, 6079, 12, 19, 6663, 4777, 6645, 12, 2257, 16, 9685, 3, 3597, 14, 8363, 3005, 7, 26, 5583, 9833, 1109, 14, 8323, 6111, 4891, 6, 22