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: ['o', '5503', '5837', '4539', '7631', 'm', '2641', 'p', '7901', '8117', 'z', '3373', '3215', 'v', 'a', '5949', 'w', '9049', 'd', 'a', 'l', 'v', 'l', 'n', 'w', 'r', 'j', '9031', '9609', '4209', 'c', '7453', '5855', '2883', '5941', 't', '4283', 'x', 'x', 'n', 'c']

A: a, c, d, j, l, m, n, o, p, r, t, v, w, x, z
****
Q: ['g', 'x', 'l', 'e', 'd', '1345', '1763', 'm', 'c', '2057', 's', 'a', '4127', 'y', 'h', '8581', 'o', '9203', '4761', 'd', 'u', 'n']

A: a, c, d, e, g, h, l, m, n, o, s, u, x, y
****
Q: ['d', 's', 'n', '7039', 't', '9035', '7663', '2981', 'a', 'l', 'm', '5401', '1071', 'x', '2995', '3363', '8619', '6253', 'p', '9065', '9533', 'g', 't', '4015', 'r', 'w', 'e', 'p', 'f', '9995', 'n', 'm', '7935', 'y', '9903', '2569', 'o', '4063', '79', '1545', 'q', 'l']

A:
a, d, e, f, g, l, m, n, o, p, q, r, s, t, w, x, y
****