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.
One example: ['8129', 'a', '4245', 'y', 'm', 'a']
Solution is here: a, m, y
Explanation: Here, the unique alphabets in the list are 'a', 'y', and 'm', hence their sorted order is 'a, m, y'.

Now, solve this: ['6909', '913', 'h', '1811', '5601', 'g', '1943', '4465', '8377', 'h', 'y', '6827', '8677', '397', 'h', 'b', 'j', '8979', 'p', '4533', 'l', '7469', '8419', '5849', 'm', 'c', 'k', '1023', '6521', '43', '4413', 'v', 'y', 'k', 'a', 'm', 'y', '8951', 's', '9429', '9369', '1013']
Solution:
a, b, c, g, h, j, k, l, m, p, s, v, y