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.

['w', 'o', 'l', '5331', 'k', '9325', '6759', '7931', '8185', 'w', 'h', 'h', 'x', '4357', '6845', 'v', 'o', '8401', 'u', 'g', 'f', 'j', 'j', '2493', '4753', 'c', 'm', '1469', '4307', 'm', '2737', 'n', 'y']
c, f, g, h, j, k, l, m, n, o, u, v, w, x, y

['2047', '4403', 'g', '3017', '1627', 'v', 'r', '2237', '5513', 'o', 'v', '7229', '9801', 'j', '443', 'z', 'q', 'y', '7447', '1659', '3411', '55', '5153', '9921', '2195', '1075', '8187', 'p', 'x', 'h', 'y', 't', 'a', 'r', 'f']
a, f, g, h, j, o, p, q, r, t, v, x, y, z

['463', 'k', '1079', 'u', 'n', 'g', 'c', 'h', '8591', 'z', 'y', 'n', 'b', 'p', '3351', '4539', 'e', 'n', '167', '115', 'p', 't', '2787', 'r', 'a', '5325', '7919', 'a', 'y', '231', '1965', '7527', '4209', 't', 'f', '9277', '5359', '3511', 'h', '9691', '6675', '5455', '4751', 'h']

a, b, c, e, f, g, h, k, n, p, r, t, u, y, z