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.

[EX Q]: ['t', 'h', '6141', 'g', 'f', 'z', 'n', 'b', 'k', '9059', 'y', 'p', '4289', '2683', 'a', '3267', 'w', 'p', 't', '3623', '7759', 'a', 'o', 'm', '9815', 'q', 'u', '8051', '6871']
[EX A]: a, b, f, g, h, k, m, n, o, p, q, t, u, w, y, z

[EX Q]: ['8527', 'p', '4697', '8415', 'v', 'l', '2669', '2649', '4349', '4201', 'r', '7573', '2041', 'f', '8047', 'u', 'm', 'm', 'j', '5695']
[EX A]: f, j, l, m, p, r, u, v

[EX Q]: ['221', '7185', 'z', 'b', '7581', 'f', 'f', '3693', '5551', 'p', 'z', 'k', 'r', 'u', '9969', 'j', 'j', '2599', '7275', '6939', '977', '1951', '4629', 'p', '7181', '8317', 'f', 'c', 'd', 'q', 'j', '5301', 'r']
[EX A]:
b, c, d, f, j, k, p, q, r, u, z