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: ['3627', '2051', '3203', 'c', 'r', 'a', '1453', 'e', 'z', 't', '1093', '4651', 'a', 'f', '8159', '9623', 'l', 't', 'r', '6963', '7071', '8103', '3493', 'y', '2369', '609', '2011', 'f', '187', 'f', 'c']

A: a, c, e, f, l, r, t, y, z
****
Q: ['f', '3409', 'i', '4147', '1745', '6007', 'l', 'd', 'i']

A: d, f, i, l
****
Q: ['5721', '4421', 'g', 'p', '263', 'm', '7069', '4049', 'x', 'q', 'j', 'y', '2739', '9421', '1933', 'p', '6521', '1197']

A:
g, j, m, p, q, x, y
****