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.

['57', 'j', 'n', '877', 'u', 'w', 'j', 'f', '8977', 'h', '469', '9417']
f, h, j, n, u, w

['l', '7111', 'd', 'e', 'h', 'z', 'x', '5673', 'v', '8255', 'i', 'z', 'c', 'i', '4287', 'q', '9293', '9137', 'p', 'n', 'o', 'n', '7883', '6453', '7355', '8769', 'y', '9153']
c, d, e, h, i, l, n, o, p, q, v, x, y, z

['a', '1105', '6609', 'q', '2217', '1569', '9071', 'c', 'o', 't', '1257', 'b', '295', '3041', '3109', '7031', 'o', 'q', '3305', 'c', '6225', 'h', '9035', '4013', '4887', '2279', '4603', 'h', 'k', 'e', '3321', '7671', '175', 'i', '6307', 'x']

a, b, c, e, h, i, k, o, q, t, x