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.

['d', '903', 'N', 'n', '1959', 'U', 'Z', 'v', 'f', '6207', '4947', '9471', 'v', '481', 'Z', '163']
4, 903, 14, 14, 1959, 21, 26, 22, 6, 6207, 4947, 9471, 22, 481, 26, 163

['U', 'C', '7173', 'r', 'Z', 'e', '4057', '5191', 'k', '73', '9335', '6143', '8871', '6023', '5765', 'O', '5379', '5269', '9935', 'K', 'V', '7561', 'j', 'R', 'o', '9207', 'F', '7169', '9941', 'm', 'J', '4203', 'k', 'B', 'G']
21, 3, 7173, 18, 26, 5, 4057, 5191, 11, 73, 9335, 6143, 8871, 6023, 5765, 15, 5379, 5269, 9935, 11, 22, 7561, 10, 18, 15, 9207, 6, 7169, 9941, 13, 10, 4203, 11, 2, 7

['4781', '1065', 'J', '5609', '6059', '7951', 'W', 'A', '6089', '5589', '8079', '5333', '7707', '3553', '419', 'v', 'S', '7161', 'p', 'd', '5729', '3121', 'F', '4963', '8847', 'g', 'P', '1893', '9339']

4781, 1065, 10, 5609, 6059, 7951, 23, 1, 6089, 5589, 8079, 5333, 7707, 3553, 419, 22, 19, 7161, 16, 4, 5729, 3121, 6, 4963, 8847, 7, 16, 1893, 9339