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.

['4031', 't', 'o', 'c', 'x', '3007', '8329', '6345', '1267', '1017', 'o', 'x', 'l', '4129', 'd', '1987', '487', 'o', 'g', 'j', 'v', 'x', '3983', 'f', 'g', '5759', 'k', 'i', 'o', 'b', 'n', '683', 'j', 'o', 't', '4361', 'u']
b, c, d, f, g, i, j, k, l, n, o, t, u, v, x

['v', '3765', '4065', 'a', '4201', 'f', 'x', '9275', 'q', '9303']
a, f, q, v, x

['5677', '2213', '1209', 'r', 'l', 'g', '2287', '825', '5821', '8697', '6473', 't', 'i', '4653', '119', '6359', 'm', '1001', 'c', 'o', '203', '9445', 'u', 'l', '1151', '3453', '1609', 'h', '8791', '281', '719', 's', '4973']

c, g, h, i, l, m, o, r, s, t, u