In this task, you are given an input list A comprising of numbers and alphabets. You need to extract and sort the unique alphabets in the list. The alphabets in the input list will only be in lowercase. Return -1 if there is no alphabet in the input list.

Q: ['5499', 'v', '6507', 'w', 'c', '8431', '8861', '5391', '4765', '4295', '1865', '485', '7255', '1205', 'p', 'w', 'q', '6833', '959', 'a', 'i', '2599', '7779', 'h', '9651', 'g', 'r', 'e', 'u', '4511', '1587', '5601', '8287', '5685', 'u', 'g', '2853', 'p', 'k']

A: a, c, e, g, h, i, k, p, q, r, u, v, w
****
Q: ['a', '7599', 'i', '9455', '3955', '2015', 'j', '7345', 'x', 't', 'c', '1317', '9155', '6383', '7793', 'n', '5581', 'v', '3485', 'n', 'r']

A: a, c, i, j, n, r, t, v, x
****
Q: ['5647', '7057', '7327', '6989', 'z', 'n', '1085', '1379', '3869', 'n', '2827', 'h', '7163', '9823', '645', '8383', '6661', 'x', 'c', 'h', 's', '6259', '3039', '7493', '7405', 'p', '3989']

A:
c, h, n, p, s, x, z
****