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.

['4031', 't', 'o', 'c', 'x', '3007', '8329', '6345', '1267', '1017', 'o', 'x', 'l', '4129', 'd', '1987', '487', 'o', 'g', 'j', 'v', 'x', '3983', 'f', 'g', '5759', 'k', 'i', 'o', 'b', 'n', '683', 'j', 'o', 't', '4361', 'u']
b, c, d, f, g, i, j, k, l, n, o, t, u, v, x

['m', '6537', '4063', '6413', 'k', 'd', '2479', 'p', '2251', 'q', '7079', 'r', 'd', 'p', '3347', '1391', '9847', '4487', 'u', '6951', '5285', '5837', '6747', 'r', 's', 'c', 'x', 'b', 'q', 'y', 'd', '331', '679', 'v', '1919', 'f', 'p', '1267', '3151']
b, c, d, f, k, m, p, q, r, s, u, v, x, y

['z', '3517', 'd', 'e', 'o', 'q', '9119', '983', '6635', '4257', '3295', 'e', 'l', 'x', 's', 'q', '5165', 'x', 'i', 'i', '8813', '6059', 's', 'c', '6293', 'n', '459', '1555', '8981', 'g', '8195', '7683', 'c', 'h', '9201', 'f']

c, d, e, f, g, h, i, l, n, o, q, s, x, z