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.

['5039', '2227', 't', 'o', '3313', 'm', 'v', '637', '6773', 'v', 'c', 'l', 'y', 'u', '3823', '9669', 'k', 'h', '3589', 'b', 'i', '3833', 's', 'm', '8201', 'u', '3143', 'k', '4111', '9769', '425', '4339', '209', 'c', 'c', '669', '8201', 'u', '7443', '2387', '6919', 'b', 'b', '2873']
b, c, h, i, k, l, m, o, s, t, u, v, y

['4637', 'f', '2639', '8623', 'w', 'e', 'k', '5503', 'x', '6633', '7553', '1455', 'u', '1773', 'r', 'u', '1489', 'u', '1303', '9683', 'z', '565', '7041', 'x', 'z', '9431', 'k', 'v', 'j', 'z', '5469', '5665', '4089', '4951', '8263', '5675', '4095', '7745', 'z', '2437', 'd', 'e', 'w']
d, e, f, j, k, r, u, v, w, x, z

['4949', 'v', 'e', 'm', 'f', 'w', 'e', 'z', 'x', '3663', 'a', '6521', 's', '7623', 'e', 'p', '995', '7287', 'j', 'b', 'y', '4445', '5917', '1711', 'i', '5265', 'j', 'f', '5877', '9553', 'j', 'j', 'a', 'u']

a, b, e, f, i, j, m, p, s, u, v, w, x, y, z