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.

['3191', '2655', '239', '2585', '3369', '7815', '5919', '8269', '5633', 'x', '8085', '2909', 'y', '2465', 'i', '1579', 'u', '2371', 'l', '1949', '51', 'e']
e, i, l, u, x, y

['477', '3931', 'g', '5967', 'm', '9845', '1607', 'a', '1749', 'k', 'j', '7945', '9125', 'v', 'n', 's', '5185', '1117', '17', 'x', '4149']
a, g, j, k, m, n, s, v, x

['1007', 'x', '7589', '9495', '8599', '6225', 'i', 'h', '6085', '3023', '5423', 'j', '5535', '5813', '1245', 'z', '6383', '4907', 'q', 'h', '515', 'v', '3371', '9849', '423', 'y', 'i', '6157', 'e', 'd', '9369', 'p', 'u', '5963']

d, e, h, i, j, p, q, u, v, x, y, z