Task: Program Execution
Input (English): Set1: '{2, 4, 8, 9, 11, 13, 14, 16, 17, 19}', Set2: '{1, 2, 5, 8, 9, 11, 14, 18, 19, 20}'. How many elements are there in the intersection of Set1 and Set2 ?
Output (English): 6