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: ['7065', 'q', 't', '3177', '9035', 'i', 'l', 'd', '8961', '1183', '6507', 'u', 'c', 't', '2467', '7659', 'e', '8963', 'j', 'g', 'p', '6779', '7115']

A: c, d, e, g, i, j, l, p, q, t, u
****
Q: ['m', '7807', 'n', 'w', '5097', '1023', '2723', 'u', '3055', '7285', 'f', 'm', 'w', '5197', '9743', '7519', '4451', 'c', 't', '1939', '5847']

A: c, f, m, n, t, u, w
****
Q: ['8383', '837', '5895', 'o', '1201', '3887', 'c', 'j', '5779', 'j', 'a', '4995', '573', '9507', '1521', '9431', 'y', 't', 'd', '7169', 'w', '1153', '2939', 'z', '6543', '6663']

A:
a, c, d, j, o, t, w, y, z
****