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:
['o', '4169', 'k', '7349', 'w', 't', '8271', '8781', '3725', '2865', '6053', 'j', 'z', '4211', '8231', '213', '6389', 'f', 'h', 'g', '9269', '4617', '4137', 'i', 'y', 'i', 'n', '4597', 'p', 'z', '3195', '3231', 'c', '1901', '1231', 'p', '4509', '2557', '3715']

Ex Output:
c, f, g, h, i, j, k, n, o, p, t, w, y, z


Ex Input:
['e', 'n', 'y', 'f', 'l', 'h', '455', 'y', '591', 'm', '9041', 'b', 'b', 'o', '4215', '5009', 'o', 'a', '4369', 'u', '6911', '4825', 't', 'k', '6063', '2939']

Ex Output:
a, b, e, f, h, k, l, m, n, o, t, u, y


Ex Input:
['t', 'm', '9575', '653', 'e', '9647', 'd', '7759', '4359', '4453', '1311', 'v', 'p', '3495', 'y', 'z', 'c', '1051', 'b', '8681', 't', '8047', 'o', '3103', '4521', 'y', '7705', 't', 'm']

Ex Output:

b, c, d, e, m, o, p, t, v, y, z