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: ['4637', 'f', '2639', '8623', 'w', 'e', 'k', '5503', 'x', '6633', '7553', '1455', 'u', '1773', 'r', 'u', '1489', 'u', '1303', '9683', 'z', '565', '7041', 'x', 'z', '9431', 'k', 'v', 'j', 'z', '5469', '5665', '4089', '4951', '8263', '5675', '4095', '7745', 'z', '2437', 'd', 'e', 'w']

A: d, e, f, j, k, r, u, v, w, x, z
****
Q: ['2697', 's', '8733', 'n', '5871', 'f']

A: f, n, s
****
Q: ['109', '4371', 'q', 'u', 'p', '397', '3839', '3245', '1259', '8135', '8743', 't', 'v', 'c', '6953', 'y', 'z', 'y', '9009', 'v', '8701', 'p', '7317', 'm', '5865', '7233', 't', 'o', '9715', 'f', '9087', '275', '8687', 'y', '7285', '3103', 'e']

A:
c, e, f, m, o, p, q, t, u, v, y, z
****