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.

['f', 't', '2135', '8397', '6361', '389', '2253', 'x', 'p', '4833', '5785', 'x', '1811', '9639', '5739', '175', '3231', '5931', 'r', 'c', 'g', 'h', 'p', '909', 'p', '587', 'a', 'a', 'h', 'q', 's', '5945', '4911', 't', 'h', '7517', 'p', '3177', 'h', 'u', '3577', '7055', 'l']
a, c, f, g, h, l, p, q, r, s, t, u, x

['7065', 'q', 't', '3177', '9035', 'i', 'l', 'd', '8961', '1183', '6507', 'u', 'c', 't', '2467', '7659', 'e', '8963', 'j', 'g', 'p', '6779', '7115']
c, d, e, g, i, j, l, p, q, t, u

['k', '3617', '4435', '1497', '4535', '5263', '1315', 'g', '8205', 'f', 'v', '2659', '7603', 'f', 's', 's', '6583', 'x', '8947', 's', 'b', 'i', 'n', 'i', 'n', '7131', '3343', 'q', 'j', '5871', 'l', 'j', 'a', '2975', 'f', '1219', '2913', '5565']

a, b, f, g, i, j, k, l, n, q, s, v, x