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.

['1189', '7143', '993', '1513', '6449', '9749', '5963', '8159', 't', '3543', 'j', 'i', '4227', '1463', '6431', '4987', 'y', 'q', 'f', '321', 'm', 'r']
f, i, j, m, q, r, t, y

['587', '3903', 'z', 'l', 'k', '5693', 'x', '1695', 'c', '3185', 'g', '9491', '8185', '1285', '2533', '6825', '3187', '6039', 'e', '251', 'w', '7741', '9573']
c, e, g, k, l, w, x, z

['8987', 'c', '7437', '479', '2845', 'm', '3385', 'i', 'p', '2581', '7207', 'i', '8151', 'l', 'd', 'l', 'w', 't', '3979', 't', 'w', 'w', 'x', 'v', '5829', 'd', '4255', 'a', 'i', '1421', '5803', '9193', '7737', '2713', '5325', 'j', 'n', '9949', 'q', 'r', '9811']

a, c, d, i, j, l, m, n, p, q, r, t, v, w, x