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.

Input: Consider Input: Set1: '{7, 9, 11, 12, 13, 14, 15, 17, 18}', Set2: '{3, 6, 7, 8, 9, 10, 11, 12}'. How many elements are there in the union of Set1 and Set2 ?

Output: 13


Input: Consider Input: Set1: '{1, 19, 7, 15}', Set2: '{1, 6, 7, 10, 11, 15, 16, 18, 19, 20}'. How many elements are there in the union of Set1 and Set2 ?

Output: 10


Input: Consider Input: Set1: '{18}', Set2: '{1, 2, 8, 9, 14, 18, 20}'. How many elements are there in the union of Set1 and Set2 ?


Output: 7