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:
['i', 's', 'f', 'i', '2293', '245', '4983', 'h', 'h', '6203', '8703', '1613', 'h', 'o', '3635', '8069', '2829', '1939', 'u', 'm', '5305', 'n', 'k', '9367', 'u']

Ex Output:
f, h, i, k, m, n, o, s, u


Ex Input:
['9925', 'f', '6149', 's', 'd', 's', '75', '8577', '2319', 'b', '3769', '5211', 'q', 'm', '8127', 'f', '3801']

Ex Output:
b, d, f, m, q, s


Ex Input:
['2173', 'z', 'v', 's', '5603', 'n', 'x', '737', 'g', '7163', 'v', '827', 'l', '8779', '9253', 'i', 'e', 'h', '2717', 'p', '4559', '5009', '7111', 'j', 'j', 'f', '8677', '5393', '4671', '3557', 'd', 't', '5667', '211', '7603', 's', 'n']

Ex Output:

d, e, f, g, h, i, j, l, n, p, s, t, v, x, z