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.

['1627', 'r', '2429', 'b', '4451', 's', 'k', 'm', '269', 'l', '709', 's', 'q', '985', 'x', 'j', 'k', 'k', '6603', 'v', '9497', '477', '5803', 'c', 't', 'f', '3189', '6419', '8561', '5709', 'u', 'z', '5717', '9711', 'w', 'y', 'm', 'v']
b, c, f, j, k, l, m, q, r, s, t, u, v, w, x, y, z

['8815', 'w', '8629', 'y', '3891']
w, y

['4321', '5409', 'g', '1857', 'r', 'a', 'w', '8717', '149', 'y', '3483', 'e', '8801', 'x', '5653', 'w', '6179', 'j', '5661', '2379', '933', 'w', '4571', '2885', '9507', 'n', '4351', 'j', 'p', 'b', '1039', 'c', '9287', '6213', 'o', 'l', '2957', 'j', '8247', '3321', '6339', '4597']

a, b, c, e, g, j, l, n, o, p, r, w, x, y