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]: ['5499', 'v', '6507', 'w', 'c', '8431', '8861', '5391', '4765', '4295', '1865', '485', '7255', '1205', 'p', 'w', 'q', '6833', '959', 'a', 'i', '2599', '7779', 'h', '9651', 'g', 'r', 'e', 'u', '4511', '1587', '5601', '8287', '5685', 'u', 'g', '2853', 'p', 'k']
[A]: a, c, e, g, h, i, k, p, q, r, u, v, w


[Q]: ['v', '5433', 'v', '6749', '7491', 'i', 'm', 'e', '5815', '8423', '833', '7359', 'm', 'i', 'f', 'u', 'p', 'j', 't', '3171', '6165', 'q', 'a', '9475', 'm', 'q', '5995', '8443']
[A]: a, e, f, i, j, m, p, q, t, u, v


[Q]: ['z', 'd', 'k', '9961', '3521', 'k', 'a', 'z', 'e', '5343', 'b', 'p', '1037', 'k', 'f', 'j', 'p', 'r', '1459', '1447', 'j', 'o', '6685', 'a', '4087', '193']
[A]:
a, b, d, e, f, j, k, o, p, r, z