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: ['4397', '2685', '9539', '4343', '6697', '7693', 'g', 'c', '3587', '4691', 'j', '8931', '7397', '2103', '3431', 'u', 'l', 's', 'v', 'q', 'd', '1289', 'h', '1695', 'h', 'j', 'e', '1225', 'e', '7893', 'o', 'i', '3351']

A: c, d, e, g, h, i, j, l, o, q, s, u, v
****
Q: ['j', 'y', '9907', 'a', '5715', 'l', '9817', '1949', '2697', '2255', '9571', '8957', '9329', '6055', 'z', 'q', '1185', '4593']

A: a, j, l, q, y, z
****
Q: ['c', '3999', '2763', '7185', 'n', 'c', '2571', '8807', 'v', '8435', '2239', '1499', 'x', 'v', 'b', '9341', 'e', '2001', '8747', 'q', 'p', 'f', '643', '1835', 'j', '6581']

A:
b, c, e, f, j, n, p, q, v, x
****