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.

['5193', 'h', 'm', '703']
h, m

['f', '9203', 'w', 'f', '3751', '8095', '1319', 'f', '3017', 'r', 'y', '8221', '2715', '9959']
f, r, w, y

['2845', 'z', '9965', 'p', 'c', 'c', '4835', '3205', 'c', '5129', 'k', 'r', 'c', '3283', 'n', '7493', '3909', '8607', '5253', 'e', '9553', '1335', 'x', '1621', '929', '6365', '2031', '3557']

c, e, k, n, p, r, x, z