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.

['c', '1693', 'l', 'u', 'x', '3609', 'h', '4159']
c, h, l, u, x

['477', '3931', 'g', '5967', 'm', '9845', '1607', 'a', '1749', 'k', 'j', '7945', '9125', 'v', 'n', 's', '5185', '1117', '17', 'x', '4149']
a, g, j, k, m, n, s, v, x

['e', 'r', 'j', '7085', '485', 'j', '2637', '3233', 'l', '9079', 'd', '4627', 'h', '509', 'u', 'z', '1555', 'x', '3977', 'r', '8667', '7235', '6921', 'j', '1767', '4503', '8429', '5867', '8617', '9731', 'm', 'o', '7085', '8315', '1469', 'u', 'v', '4905', '8197', '4689', '6343', 'l']

d, e, h, j, l, m, o, r, u, v, x, z