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.

Ex Input:
['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']

Ex Output:
a, c, e, f, l, r, t, y, z


Ex Input:
['r', '4655', 'm', 'l', '4371', 'o', '5331', '5469', 'j', 'u', '4915', 'v', 'i', 'f', 'j', '6139', 'y', '2423', '1271', '2289', '5565', '7561', '9697', 'e', 's', 'u', '9581', 'y', '6095', '5047', '625', '9047', 'd', 's', '8307', '3615', '8145']

Ex Output:
d, e, f, i, j, l, m, o, r, s, u, v, y


Ex Input:
['689', 'k', '5327', '1349', 'v', 'n', '6233', '347', '6211', 'u', '5979', 'z', '2811', 'h', 'g', 's', '1465', 't', 'p', '1913', 't', 'u', 'j', '9079', 'v', 'p', 'i', '9997', 'h', 'v', 'i', '699', 't', 'v', 'z']

Ex Output:

g, h, i, j, k, n, p, s, t, u, v, z