In this task, you are given two sets, and you need to count the number of elements at the union of two given sets. A Set is shown by two curly braces and comma-separated numbers inside, like {1, 2, 3}. Union of two given sets is the smallest set which contains all the elements of both the sets. To find the union of two given sets, A and B is a set that consists of all the elements of A and all the elements of B such that no element is repeated.

Example Input: Set1: '{4, 7, 8, 12, 13, 15, 16}', Set2: '{1, 10, 2, 12}'. How many elements are there in the union of Set1 and Set2 ?
Example Output: 10

Example Input: Set1: '{1, 7, 9, 11, 12, 15, 19}', Set2: '{16, 11, 13, 7}'. How many elements are there in the union of Set1 and Set2 ?
Example Output: 9

Example Input: Set1: '{1, 14, 6, 15}', Set2: '{19}'. How many elements are there in the union of Set1 and Set2 ?
Example Output:
5