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.

['d', 'g', '9019', '9987', '8713', '9513', 'a', '2043', 'd', '5817', 'w', 'd']
a, d, g, w

['c', 'e', '6509', '1295', 'u', '5445', '1731', '3049']
c, e, u

['3967', '7661', '2841', '8749', '8369', 'l', 'j', '6677', '7737', 'w', '8393', 's', 'x', '6401', '6831', 'b', 'x', 'z', 'n', '5939', '3829', 'b']

b, j, l, n, s, w, x, z