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.

['y', 'u', 'c', '5909', 'x', '9865', 'e', 'h', '5125', '4719', 'w', '8855', 'i', 'd']
c, d, e, h, i, u, w, x, y

['4787', 'c', '1727', '9863', '8147', '3931', 'b', '1133', '3023', '7427', '7837', 'n', '7921', 'o', 'c', '3973', '1949', 'x', 'g', 'b', 'd', '8559', '8661', '4465', 'z', '369', 'q', 'e', 'y', '8629', '7665', 'i', 'r', 'n', 'z', '9115', '1393', '4899']
b, c, d, e, g, i, n, o, q, r, x, y, z

['2957', '9101', '2365', 'j', 'a', '8883', 'q', 'i', 'i', 'v', 'n', 'g', 'f', 'z', '4677', 's', 'p', 'q', '2809', '6443', 'n', 'k', '3767', '4183', '6483', 'l', 'x', '8199', 'c', '97', '7181']

a, c, f, g, i, j, k, l, n, p, q, s, v, x, z