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.

['3043', 'r', 'm', 'i', '2653', 'i', '1703', '1125', '6299', '4863', 'n', 'h']
h, i, m, n, r

['r', 'n', '7583', '8697', '7927', 'l', '5003', '1363', 'p', 'e', 'q', '6227', '6915', '8619', '9011', 'n', '3063', '3799']
e, l, n, p, q, r

['5955', 'v', '4943', '9549', '2663', '509', '3103', '7807', 'g', 'd', '5387', 'p', 's', '931', '3969', 'y', '3791', 'd', 'g', 'b', '2425', 'g', '4457', '6893', '7591']

b, d, g, p, s, v, y