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.

Ex Input:
Set1: '{1, 4, 8, 16, 17, 18, 20}', Set2: '{18, 20, 6}'. How many elements are there in the union of Set1 and Set2 ?

Ex Output:
8


Ex Input:
Set1: '{10}', Set2: '{14}'. How many elements are there in the union of Set1 and Set2 ?

Ex Output:
2


Ex Input:
Set1: '{10}', Set2: '{2, 4, 6, 7, 9, 11, 12, 13, 14, 17}'. How many elements are there in the union of Set1 and Set2 ?

Ex Output:

11