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:
['w', 'o', 'l', '5331', 'k', '9325', '6759', '7931', '8185', 'w', 'h', 'h', 'x', '4357', '6845', 'v', 'o', '8401', 'u', 'g', 'f', 'j', 'j', '2493', '4753', 'c', 'm', '1469', '4307', 'm', '2737', 'n', 'y']

Ex Output:
c, f, g, h, j, k, l, m, n, o, u, v, w, x, y


Ex Input:
['2293', 'p', '9787', '7241', '8689', 'u', '3141', 'h', 'c', 'b', 'f', 's', '319', 'c', 'p', '6909', 'p', 'f', '1717', 'd', '2285', 's']

Ex Output:
b, c, d, f, h, p, s, u


Ex Input:
['t', 'z', '8453', 'x', 's', '2941', '4723', '6653', 'd', '417', 'i', 'z', 'r', 'a', '9549', '9847', '5531', 'y', '3221', 'w', '3237', 'w', '1763', '3131', '7405', 'z', 'f', 'c', '3861']

Ex Output:

a, c, d, f, i, r, s, t, w, x, y, z