Task: Program Execution
Input (English): Set1: '{2, 3, 5, 8, 11, 13, 15, 18, 20}', Set2: '{3, 4, 5, 7, 10, 14, 15, 16, 17, 20}'. How many elements are there in the intersection of Set1 and Set2 ?
Output (English): 4