Task: Program Execution
Input (English): Set1: '{2, 8, 9, 11, 13, 16, 17, 19, 20}', Set2: '{2, 3, 7, 8, 11, 13, 14, 17, 18, 19}'. How many elements are there in the intersection of Set1 and Set2 ?
Output (English): 6