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.

['4925', '9943', '7935', '4387', '2449', '5797', 'i', '1517', 'w', 'e', '9525', 'y', 't', 'e', '2793', 'v', '9897', '8709', '7247', 'o', 'f', '5549', 'q']
e, f, i, o, q, t, v, w, y

['9555', '5983', '1853', 'c', 'z', 't', 'p', '9041', 'd', '5919', '1621', '345', 's', '2647', '4261', '8611', 'w', 'x', 'p', '9103', '2599', '5101', '9261', 'k', '7437']
c, d, k, p, s, t, w, x, z

['b', 'q', 'w', '209', 'h', '9323', 'c', 'g', 'i', '9231', '7143', '7315', 'h', '8809', '3049', '6505', '2815', '8511', 't', 'f', 'e', 'k', '8091', '7723', '7335', '4581', 'f', 'o', 'i', 'q', 's', 'h']

b, c, e, f, g, h, i, k, o, q, s, t, w