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: ['1657', 'u', '1849', '425', 'v', '6435', 'j', '2985', '921', '9553', '2621', 'i', '7103', 'd', '8563', 'l', 'b', '6727', '4235', 'n', '8021', 'd', 'z', '437', 'm', '5695', 't', '3421', 'e', 'a', '2941', '791', '1417', '9247', 'h']

Output: a, b, d, e, h, i, j, l, m, n, t, u, v, z


Input: Consider Input: ['h', '1797', '8211', 'n', 'r', '7707', '2063', '4655', 'x', '5521', '8327', 'g', '7659', 'i', 'x', 'w', '9465', '4625', 'q', '5377', 'r', '225', 'r', 'i', 'e', '4163', 'g', 'g', '3537', 's']

Output: e, g, h, i, n, q, r, s, w, x


Input: Consider Input: ['5479', 'u', '691', '4109', 'd', '5415', 'w', '6509', 'u', 'm', 'e', 'l', '585', '6813', 'y', 'i', 'f', '7731', '3207', 'y', '3323', 'y', 'g', 'x', '8521', '6995', '6253', 'u', '1747', '2727', '5589', 'u', 'h', '3097', 'g', '6579', '5153', '7929', 't', '3633']


Output: d, e, f, g, h, i, l, m, t, u, w, x, y