Task: Program Execution
Input (English): Set1: '{2, 6, 7, 8, 9, 12, 13, 16, 17, 19}', Set2: '{1, 2, 3, 4, 7, 11, 14, 16, 17, 20}'. How many elements are there in the intersection of Set1 and Set2 ?
Output (English): 4