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.

['l', '1213', 'm', 'k', '7825', '3501', '2397', '2313', 'v', '4119', 'h', 't', '6137', 'l', '9851', 'q', '9661', 'b', 'z', '1437', '1759', 'l', '611', '5085', '4443', 'n', 'u', 'b', '2511', '6023', '7157', 'n', '9921', 'o', 'a', 'o', 'w', 't', 'o', '1607', '6751', 'n', 'b']
a, b, h, k, l, m, n, o, q, t, u, v, w, z

['5499', 'v', '6507', 'w', 'c', '8431', '8861', '5391', '4765', '4295', '1865', '485', '7255', '1205', 'p', 'w', 'q', '6833', '959', 'a', 'i', '2599', '7779', 'h', '9651', 'g', 'r', 'e', 'u', '4511', '1587', '5601', '8287', '5685', 'u', 'g', '2853', 'p', 'k']
a, c, e, g, h, i, k, p, q, r, u, v, w

['k', 's', 'v', 'p', 'q', '8085', 'v', '9275', '8905', '1381', '9451', 'x', 'j', 'u', '8371', '5661', '6861', 'i', 'r', 'a', '8887', '9645', '5203', '4489', 'g', 'p', '5145']

a, g, i, j, k, p, q, r, s, u, v, x