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: ['5761', '2289', '577', 't', '125', 'i', 'g', '9693', '747', 'd', '4829', '9587', 'f', 'k', 'w', 'v', '8607']

A: d, f, g, i, k, t, v, w
****
Q: ['v', '5433', 'v', '6749', '7491', 'i', 'm', 'e', '5815', '8423', '833', '7359', 'm', 'i', 'f', 'u', 'p', 'j', 't', '3171', '6165', 'q', 'a', '9475', 'm', 'q', '5995', '8443']

A: a, e, f, i, j, m, p, q, t, u, v
****
Q: ['1181', 'i', '7671', '433', '7275', '1499', '843', '5945', '2673', 'n', '5719', '129', 'u', 'b', '5981', '4611', '9567', 'e', '2759', 'v', '3721', 'o', '5781', '5025', '7805', 'u', 'e', '651', 'e', '551', '5471', '5287', '515', 'j', '5865', '3713', 'i', 'v', 'r', 'g', '7409', '7661', '1235']

A:
b, e, g, i, j, n, o, r, u, v
****