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.

['3627', '2051', '3203', 'c', 'r', 'a', '1453', 'e', 'z', 't', '1093', '4651', 'a', 'f', '8159', '9623', 'l', 't', 'r', '6963', '7071', '8103', '3493', 'y', '2369', '609', '2011', 'f', '187', 'f', 'c']
a, c, e, f, l, r, t, y, z

['333', 'b', '261', 'k', 'p', '7861']
b, k, p

['53', '8851', 'k', '3701', 'u', 'g', '2565', '6631', '9947', '5231', '937', 't', '4333', '8233', '5037', '1429', 'a', 'p', 'b', 's', 'd', '1745', 'd', '7523', 'i', '8181', 'g', '5857', '9559', '4407', 'l', 'i', '7469', 'i', 'i', 'k', 'c', 's', 'x', '3407', '6367', 'r', 'c', '5979', '5181']

a, b, c, d, g, i, k, l, p, r, s, t, u, x