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: ['r', 'n', '7583', '8697', '7927', 'l', '5003', '1363', 'p', 'e', 'q', '6227', '6915', '8619', '9011', 'n', '3063', '3799']

A: e, l, n, p, q, r
****
Q: ['4423', '8295', 'h', '4881', 'j', 'c', '1185', 'z', 'm', '2725', 'p', '9187', '6275', '1617', '2523', '9879', '4149', '2197', '3909', '5155', '691', 'r', 'e', 'u', 'l', 'd', '1581', '2763', 'c']

A: c, d, e, h, j, l, m, p, r, u, z
****
Q: ['6255', 'q', '8831', '3099', 'f', '1023', '6415', '2235', 'l', 'f', 'q', '6259', '4019', '7195', 'u', 'v', '3535', '3345', 'u', 'n']

A:
f, l, n, q, u, v
****