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.

Input: Consider Input: ['3043', 'r', 'm', 'i', '2653', 'i', '1703', '1125', '6299', '4863', 'n', 'h']

Output: h, i, m, n, r


Input: Consider Input: ['2293', 'p', '9787', '7241', '8689', 'u', '3141', 'h', 'c', 'b', 'f', 's', '319', 'c', 'p', '6909', 'p', 'f', '1717', 'd', '2285', 's']

Output: b, c, d, f, h, p, s, u


Input: Consider Input: ['f', '7025', 'u', '2263', 'z', '3525', '3339', '5733', '4859', '447', 'p', 'y', '8169', '5601', '4329', 's', '5783', '2425', '1351']


Output: f, p, s, u, y, z