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: ['s', '6723', 'l', '1573', '1129', 'n', '4277', '5003', 'y', '7563', 'c', '6747', '3105', 's', '3593', '8417', '8253', '4157', 'w', 'f', 'z', 'd', '9685', '1033', 'h', '4893', 't', 'j', '6821', 'z', 'a', 'u', '591', 'o', '1087', '2147', '1223', '2339', 'i', 'y', '9307', 'x', 'z', 'r', 'y']

A: a, c, d, f, h, i, j, l, n, o, r, s, t, u, w, x, y, z
****
Q: ['j', 'a', 'z', 'h', '4129', '4159', 'm', 'o', 'o', '1193', '2905', '3083', 'q', 't', 'm', 'o', '673', '7547', 'n', 'c', 'r', 't', '2897', '4959', 'z', '2377', 'y', '7977', 'u', 'b', 's', 'w', 'e', 'd', '8051']

A: a, b, c, d, e, h, j, m, n, o, q, r, s, t, u, w, y, z
****
Q: ['d', '7613', '5447', '8095', '83', 'a', '3239', '5213', '2479', 'u', '9539', 't', 's', '1157', '7543', '863', 't', '3713', '8627', 'n', '505', 't', 'd', 'h', '9335', 'm', '7461', 'd', 'j', '1469', '2805', '7205', 'd', '2899']

A:
a, d, h, j, m, n, s, t, u
****