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]: ['3127', '9253', '5667', '9453']
[A]: -1


[Q]: ['8281', '4831', '1329', 'g', 'e', '8879', 'n', 's', 'x', 'j', '6305', 'j', '921', '3677', '5107', 'n', 'j', '9285', 'a', '5329', '6671', 'c', '9283', 'l', 'a', '7907', 'q', '7605', '855', '6477']
[A]: a, c, e, g, j, l, n, q, s, x


[Q]: ['5605', 's', '2371', 'z', 'w', '7225', 'k', '2541', '6601', '9211', '429', '611', '8675', 'k', 'v', '3757', 'u', '1649', '2355', 't', 'r', '5999', 's', 'o', 'c', 'o', 'o', '4037', 'b']
[A]:
b, c, k, o, r, s, t, u, v, w, z