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: ['4041', 'l', 'g', '9571', '9295', '1395', 'l', 'p', 'f', 'w', 'g', '1721', '2421', 'w', 'z', '2235', 'p', '7851']

A: f, g, l, p, w, z
****
Q: ['3651', 'c', 'm', '7123', '2981', '9649', 'o', '2181', 'h', '8577', 'a', '5027', 'x', 'u', '1039', '347', '8219', 'c', '1063', '8885', 'f', 'd', '3067', '2509', 'i', 's', '5509', '2003', 'h', '8869', 'x', 'd', '5141', 'h', 'i', 'b', 'o']

A: a, b, c, d, f, h, i, m, o, s, u, x
****
Q: ['b', '4365', '9919', 'i', '8907', '4151', 'c', 'u', '539', 's', '9927', 'a', '1525', 'i', 'v', 'h', 'j']

A:
a, b, c, h, i, j, s, u, v
****