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.

['9351', 'v', 'h', 'z', 'g', 'f', 't', 'q', 'g', 'o', '4073', 'n', '6149', '1735', '157', 'm']
f, g, h, m, n, o, q, t, v, z

['c', '8389', 'j', '6113', '5843', 'f']
c, f, j

['t', 'z', '4387', 'm', 'l', '9209', 't', 'w', 'y', '7543', '8167', 'o', 'i', '7185', '2909', '5161', 'g', '8865', 'j', 'z', '1325', '3519', '1279', '4289', '7111', 'd', '9049', '6097', 'j', '9647', '8291', '8605', 'i', 'p']

d, g, i, j, l, m, o, p, t, w, y, z