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.

['e', '2239', 'l', '8309', 'i', '2613', 'i', '611', '6481', 'j', 'v', '1867', '415', '269', '8053', '3369', 'q', 't', '2303', '7729', '1059', '6135', '3299', 'd', '6855', '207', '6227', '7859']
d, e, i, j, l, q, t, v

['o', 'c', '6469', 'x', '8815', '4441', '6193', 'u', 'm', 'a', '9879', 'p', '8335', 'c', 'z']
a, c, m, o, p, u, x, z

['4769', '7439', '1159', 'b', 'v', 'd', 'i', '3823', '8623', '8801', 'i', 'x', '5963', '1133', '1301', '3191', 'o', 'r', 'v', 'u', 'b', 'i', 'q', 'j', '6675', '1329', '1465', 'j', 'g', '961', '9325', '6131', 'k', '8467', '3149', 'i', '5765', '4211']

b, d, g, i, j, k, o, q, r, u, v, x