Given the task definition and input, reply with output. 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.

Set1: '{9, 6, 1}', Set2: '{1, 18, 14}'. How many elements are there in the union of Set1 and Set2 ?

5