Task: Program Execution
Input (English): Set1: '{2, 3, 4, 6, 9, 11, 14, 15, 19, 20}', Set2: '{1, 6, 8, 9, 10, 12, 14, 16, 17, 19}'. How many elements are there in the intersection of Set1 and Set2 ?
Output (English): 4