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:
['h', 'b', '9601', 'h', 'h', 'h', '8099', '8265', 'i', 'd', '8791', 'p', '8059', '4309', '501', '2581', '9837', '157', '4785', '5925', 'q', '8491', '4779', 'r', 'l', 'k', '3679', 'v', 'g', 'g', '9731', '1909', '9783', 'f', '4293', '5009', 'o', '3057', '3157', 'c', '5587', 'b', 'f', 'd', 'k']

Ex Output:
b, c, d, f, g, h, i, k, l, o, p, q, r, v


Ex Input:
['4371', '9499', 'e', 'w', '9969', '8367', '2897', '1745', 'i', '7049', '9773', 'h', '9649', 'u', '4673', '8513', '8547', 'z', '1995', '7739', '2215', '171', 'c', '7527', '2479', 't', '5223', 'p', '2313', '3243', '2281', 'r', 'c']

Ex Output:
c, e, h, i, p, r, t, u, w, z


Ex Input:
['623', '4621', 'k', '4839', 'w', '2957', 'x', 'o', 'a', '9781', 'b', '1325', '8901', '5011', '8265', 'l', '3127', '8993', 'g', 'h', '751', 'q', 'a', 'f', 'j', 'g', 'q', 'r', '8125', 't', '2745', 'z', '5247', 'm', '91', 'j', '689']

Ex Output:

a, b, f, g, h, j, k, l, m, o, q, r, t, w, x, z