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.

['5161', 'v', 'y', '6005', 'y', 'l', '5451', 'z', 'j', 'd', '4597', '9319', '1241', 'g', 'f', 'b', 'g', '683', '763', 'm']
b, d, f, g, j, l, m, v, y, z

['1593', '8165', 'q', '6689', 'b', 'r', '373', 'g', '6505', '415', '495', 'j', 'j', 'f']
b, f, g, j, q, r

['4637', '3467', '1779', '1481', 'z', '7321', '2491', '9659', '2207', 'p', '3565', '1605', '7201', '675', 'h', 'd', '7527', 'b', '4347', '83', '709', 't', '6023', '5807', '7069', 'k', '8579']

b, d, h, k, p, t, z