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.

Q: ['7591', '1403']

A: -1
****
Q: ['r', '4655', 'm', 'l', '4371', 'o', '5331', '5469', 'j', 'u', '4915', 'v', 'i', 'f', 'j', '6139', 'y', '2423', '1271', '2289', '5565', '7561', '9697', 'e', 's', 'u', '9581', 'y', '6095', '5047', '625', '9047', 'd', 's', '8307', '3615', '8145']

A: d, e, f, i, j, l, m, o, r, s, u, v, y
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Q: ['z', '9457', '6447', 'v', 'u', '7501', '5411', 'j', '8127', 'v', '2361', '719']

A:
j, u, v, z
****