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]: ['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']
[A]: a, b, f, g, h, k, m, n, o, p, q, t, u, w, y, z


[Q]: ['o', '4167', 'b', '1651', '8327', '9219', 'o', 'v', '5841', '6057', 'i', 'q', 'o', 'r', 'a', '7069', 'y', 'h', 'd', '3775', 'j', 't', '3663', '55', '7117', 'e', 'u', 'm', '931', '5777', '8773', '4891']
[A]: a, b, d, e, h, i, j, m, o, q, r, t, u, v, y


[Q]: ['129', '2263', '5209', 'a', '8055', '7019', 'j', '3373', '2639', 'h', 'b', 'g', '799']
[A]:
a, b, g, h, j