Task: Program Execution
Input (English): Set1: '{4, 6, 7, 8, 10, 13, 17, 18, 19}', Set2: '{2, 4, 5, 7, 8, 11, 12, 13, 16, 19}'. How many elements are there in the intersection of Set1 and Set2 ?
Output (English): 5