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.

['p', '6123', '6961', 't', 'p', 'h', '9035', 'r', '6341', 'x', '3635', '5885', 't', '3543', '9567', '1787', 'o', '2991', 'k', '3441', '4091', 'a', 'r', '423', '9383', '7147', 'h', '663', 'd']
a, d, h, k, o, p, r, t, x

['s', '6723', 'l', '1573', '1129', 'n', '4277', '5003', 'y', '7563', 'c', '6747', '3105', 's', '3593', '8417', '8253', '4157', 'w', 'f', 'z', 'd', '9685', '1033', 'h', '4893', 't', 'j', '6821', 'z', 'a', 'u', '591', 'o', '1087', '2147', '1223', '2339', 'i', 'y', '9307', 'x', 'z', 'r', 'y']
a, c, d, f, h, i, j, l, n, o, r, s, t, u, w, x, y, z

['m', 'q', '4537', '6469', 'y', '9011', '567', '153', '2073', '5811', '4175', 'p', '2663', '8951', 't', '8273', '2389', 'u', 'r', '6051', 'r', '169', '7499', 'q', 'h', 'o', 'u', 'p', 'j', 'j', 'w']

h, j, m, o, p, q, r, t, u, w, y