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.

['5859', 'x', 'z', 'v', 'l', 'z', 'g', 't', 'x', '341', '7023', '4937', 'b', 'n', 'y', 't', 's', '1369', '4461', 'f', '1315', 'l', '5221', '6583', 'h', 'j', 't']
b, f, g, h, j, l, n, s, t, v, x, y, z

['b', 't', '2199', 'e', 'i', '1883', '5137', '8495', 't', '7377', 'm', '7665', '2009', 'o', '3757', 'm', '861', 'm', 'l', '9229', 'c', 'r', 'q', 'i', 'm', '705', 'b', '4301', 'd', 'l', 'f', '5485', 'h', 'p', '4529', '7879', 'f', 'b', 'm']
b, c, d, e, f, h, i, l, m, o, p, q, r, t

['6103', '887', '2281', '3975', 'z', 'w', '9129', '9059', 'g', 'm', 'j', 'm', '1831', '9109', '5825', '7125', 'o', '2929', '6791', 'd', '2767', '9139', '4309']

d, g, j, m, o, w, z