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: ['5611', 'x', 't', 'p', '5711', '7079', '5251', '429', 'z', 'u', '8721', '9321', '79', 'i', '189', '3605', 'k', '445', 'r', 'k', 'o', '2189', '8521', '8849', '2651', 'm', '4149', '1577', '3085', '5275', '6413', '5265', '6089', 'r', 'f', '5013']

A: f, i, k, m, o, p, r, t, u, x, z
****
Q: ['w', '1349', '3393', '7507', '2469', '8531', 'w', '6845', 'k', 'q', '2401', 'f', 'g', 'l', 'n', 'n', 'e', 'q', 'y', 'v', '3077', '4167', 'b', '5517', 'b']

A: b, e, f, g, k, l, n, q, v, w, y
****
Q: ['h', '4575', 'v', '1313', '8075', '7271', '3301', 'x', '2365', 'l', '2839', '4465', 'g', 'o', 'r', 't', 'b', '7315', 'e', '8095', '8923', '3315', 'g', 'm', '4549', '2965', '8965', 'b', '1355', '1837', 'd', 'n', '3411', '4865', 'l']

A:
b, d, e, g, h, l, m, n, o, r, t, v, x
****