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.

['5973', 'h', '4081', 'i', '8059', 'w', 'j', '6175', 'w', '8685', '5811', 'k', 'n', '5577', '9817', 'v', '8617', 'u', 'y', '3921', 'b', '1027', '5405', 'a', '3501', '6659', 's', 'e', '157']
a, b, e, h, i, j, k, n, s, u, v, w, 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

['t', 's', 'v', '7151', 'b', 'x', 'n', 'p', '1915', 'l', 'e', 'm', '6705', '1961', 'b', '4657', 'x', '5253', '7787', 'a', 'x', '8811', 'i', 'n', 'd', '3633', 'd', 'a', '5829', 'q']

a, b, d, e, i, l, m, n, p, q, s, t, v, x