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.

Q: ['l', '7111', 'd', 'e', 'h', 'z', 'x', '5673', 'v', '8255', 'i', 'z', 'c', 'i', '4287', 'q', '9293', '9137', 'p', 'n', 'o', 'n', '7883', '6453', '7355', '8769', 'y', '9153']

A: c, d, e, h, i, l, n, o, p, q, v, x, y, z
****
Q: ['l', '6313', '3199', 'w', '249', '8747', '7391', '3871', '173', 'x', 'o', '8647', '4413', '3645', '6123', '701', 'q', '2147', '4289', '7333', '533']

A: l, o, q, w, x
****
Q: ['e', '109', 'z', '9603', '9127', 'v', 'z', 't', '6337', 'r', '7339', '7139', '6093', '3179', 'w', 'e', 'h', 't', 'a', 'n', 'p', 't', 'h', 'r', '9775', 'm', '6917', 'i', '715', '9303', '2715', 'g', '1969', 'n', 'p', '8943', 's', '4333', '3251', 'n', 's']

A:
a, e, g, h, i, m, n, p, r, s, t, v, w, z
****