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.

['S', '6599', 'i', 'u', '7321', '859', '171', '7539', 'u', 'q', 'Y', '5699', '5409', 'C', '2885', '8065', '4941', '5981']
19, 6599, 9, 21, 7321, 859, 171, 7539, 21, 17, 25, 5699, 5409, 3, 2885, 8065, 4941, 5981

['4647', '3833', '9203', '8189', '6519', 'R', '4503', '2261', 'T', 'W', '6593', 'V', 'i']
4647, 3833, 9203, 8189, 6519, 18, 4503, 2261, 20, 23, 6593, 22, 9

['Y', '157', '1019', '8669', 'J', 'f', '39', 'O', 'J', '5749', '8559', 'o', 'D', '7599', '8367', 'N', 'G', '5019', '3385', '9481', '7945', '6751', '3673']

25, 157, 1019, 8669, 10, 6, 39, 15, 10, 5749, 8559, 15, 4, 7599, 8367, 14, 7, 5019, 3385, 9481, 7945, 6751, 3673