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

A: b, d, f, g, j, l, m, v, y, z
****
Q: ['7417', '2597', '2633', '7721', 'v', 'l', 'p', '4389', 'l', '3965', '6279', 'm', 'v', 'o', 'd', 'o', 'h', 'd', 'r', 'e', '8993', '2711', 'o', 'q', '1399', 'i']

A: d, e, h, i, l, m, o, p, q, r, v
****
Q: ['g', '2661', 'x', 'a', '5237', 'j', '2779', '7075', 'b', 'r', '7457', '5479', '4803', 'c', 'z', '3721', '143', '4455', 'p', '2291', '2617', 's']

A:
a, b, c, g, j, p, r, s, x, z
****