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: ['w', 'o', 'l', '5331', 'k', '9325', '6759', '7931', '8185', 'w', 'h', 'h', 'x', '4357', '6845', 'v', 'o', '8401', 'u', 'g', 'f', 'j', 'j', '2493', '4753', 'c', 'm', '1469', '4307', 'm', '2737', 'n', 'y']

A: c, f, g, h, j, k, l, m, n, o, u, v, w, x, y
****
Q: ['2633', 'd', 'r', '8083', 'f', 'd', '5121', '8651', 'o', 'b', '811', '7551', 'x', 'p', 'm', 'v', 'm', '7833', '1959', 'y', 'p', '779', '1889']

A: b, d, f, m, o, p, r, v, x, y
****
Q: ['4307', 'f', 'q', 'h', '285', 'c', '9283', 'k', 'm', 'g', 'o', '7173', 'v', '4929', '8213', '5029', 'g', '4241', 'h', 'e', 'u', '4051', 'd', '1815', '7581', '9129', 'f', '3989', '2795']

A:
c, d, e, f, g, h, k, m, o, q, u, v
****