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.

['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']
c, d, e, g, h, i, j, l, o, q, s, u, v

['x', 'j', '9747', 'i', '2015', '3505', 'q', 'n', 'h', '3011', 'u', '8043', 'j', 'f', 'd', 'a', 'p', '5817', 'l', 'q', '2275', 'n', '7085', '5373', 'l', 'g', 'b', '8043', '3085']
a, b, d, f, g, h, i, j, l, n, p, q, u, x

['i', 'i', '3915', '9255', 'g', 'x', '1629', '5391', 'a', 'w', 'b', '281', '4817', '8241', 's', 'd', '7111', '1045', '5135', '5959', '6295', 'k', '893', 'c', '7739', '5083', 'm', '1941', '9851', '4427', 'k', 'o', '1721', '5569', 'j', '7961', 'p']

a, b, c, d, g, i, j, k, m, o, p, s, w, x