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:
['5293', '2211', 'r', 'j', 'x', 'y', 'u', 'n', 'r', 'l', 'v', '113', 'v', 'e', '1323', '6291', 'a', '7417', 'j', '4175', 'd', '855', 'z', '1123']

Ex Output:
a, d, e, j, l, n, r, u, v, x, y, z


Ex Input:
['7653', 'n', '697', '4565', 't', '7275', '2429', '1365', '7059', 'o', '8053', 'j', '2837', '957', '851', 'z', 'd', 'd', 'y', 'c', '7467', 'o', 'i', '9519', 'q', 'g', '7911', 't', 'g', '3439', '5821', '8433', 'k', 'z', 's', 'g', '685', 'i', 't', 'r', '6881']

Ex Output:
c, d, g, i, j, k, n, o, q, r, s, t, y, z


Ex Input:
['2055', 'z', '4635', 'a', '3305', '8099', '6729', '7459', '9031', '4539', 'z', 's', '1867', 'l', 't', '8783', '9537', 'u', 'p', 'n', 's', '7271', '8795', '4707', 'f', 'm', 'b', 'u', '5751', 't']

Ex Output:

a, b, f, l, m, n, p, s, t, u, z