In this task, you are given two sets, and you need to count the number of elements at the intersection of two given sets.  A Set is shown by two curly braces and comma-separated numbers inside, like {1, 2, 3}. The intersection of two given sets is the largest set which contains all the elements that are common to both sets. To find the intersection of two given sets, A and B is a set consisting of all the elements common to both A and B.

Input: Consider Input: Set1: '{2, 20, 4, 7}', Set2: '{2, 3, 7, 10, 13, 14, 15, 17, 20}'. How many elements are there in the intersection of Set1 and Set2 ?

Output: 3


Input: Consider Input: Set1: '{2, 11, 12, 4}', Set2: '{19, 20, 12, 14}'. How many elements are there in the intersection of Set1 and Set2 ?

Output: 1


Input: Consider Input: Set1: '{11}', Set2: '{1, 4, 9, 13, 17, 18, 19, 20}'. How many elements are there in the intersection of Set1 and Set2 ?


Output: 0