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]: ['e', 'k', '7569', '6387', '4593', '2445', '345', '2905', 'h', '3119', '7001', 'x', 'a', '2943', '3635', 'l', 'q', 'z', 'g', '2657', '7849', 'i', '9413', 'm', 'e', '2951', 'd', '2963', 'b', 'u', 't', 'i', '1141', 'c', 'm', '8607', 's']
[A]: a, b, c, d, e, g, h, i, k, l, m, q, s, t, u, x, z


[Q]: ['8301', 'd', 'p', 'l', 'm', '9099', 'o', '8045', 'e', 's', 't', '8853', 'v', '6375', 'q', '2505', 's', '4219', '3587', 'g', '651', '7129']
[A]: d, e, g, l, m, o, p, q, s, t, v


[Q]: ['8441', 'r', 'v', 'w', 'q', '2539', 'y', 'l', '3933', '6819', '5597', 'o', '8047', '6759', '7993', 'c']
[A]:
c, l, o, q, r, v, w, y