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.

['9385', '4021', 'y', '9629', 'u', '7623', 'd', '5155', 'x', '2605', '8893', 'l', 'p', 'a', 'm', '6699', 'i', '4503', '6623', 'm', 'l', '6115', 'p', 'w', '9691', '811', '4769', '2659', 'x', 'c', '6513', '5499', 's', 'q', 'f', 'v', 'z', 'w', 'z', '1361']
a, c, d, f, i, l, m, p, q, s, u, v, w, x, y, z

['6643', '6757', 'h', '1033', 's', 'c', '2003', 'p', '5483', 'f']
c, f, h, p, s

['6633', '6435', '9825', '1399', 'u', '3169', 'p', 'h', 'b', '4475', '6325', '2409', '6175', '7107', 'a', 'e', '7741', '7937', '3291', '6625', 'j', '8091', '4525', '8289', 'p', '7329', 'e', '257', '571', '6755', '9885', 'a']

a, b, e, h, j, p, u