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: ['e', '2239', 'l', '8309', 'i', '2613', 'i', '611', '6481', 'j', 'v', '1867', '415', '269', '8053', '3369', 'q', 't', '2303', '7729', '1059', '6135', '3299', 'd', '6855', '207', '6227', '7859']

Output: d, e, i, j, l, q, t, v


Input: Consider Input: ['1799', '6409', '9257', '5923', 'm', 'j', '2565', '715']

Output: j, m


Input: Consider Input: ['c', '9127', 'a', '2557', 'u', '1035', '6293', '1261', 'y', 'u', '9909', '1693', '6571', 't', 'q', '5003', '3647', '3825', 'u', 'q', 's', '1309', 'a', '3131']


Output: a, c, q, s, t, u, y