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:
['v', 'd', '3805', '8031', '3327', 'c', 'n', '6153', '2705', 'w', '5675', '6543', 'm', 'v', 'y', 'd', '2943', '4423', '515', '4501', 'y', '9377', 'j', 'i', 'f', '4749', 'o', 'r', '2605', 'm', '117', 'o', '9197', 't', 'l', '4145']

Ex Output:
c, d, f, i, j, l, m, n, o, r, t, v, w, y


Ex Input:
['5553', 'f', '3881', '8867', 's', 'd', 'a', '375', '7889', '3949', '2905', 'w', 'q', 'q', 'd', '4203', 'i', '2601', 'y', 'p', 'k']

Ex Output:
a, d, f, i, k, p, q, s, w, y


Ex Input:
['4749', 'b', 'p', 'a', '7373', '8465', '7865', '4139', '5363', 'n', 'g', 'c', '7409', '1011', 'z', 'v', '1897', '9111', '4581', 'e', '2827', '1373', '4631']

Ex Output:

a, b, c, e, g, n, p, v, z