Task: Program Execution
Input (English): Set1: '{4, 6, 7, 8, 11, 12, 13, 14, 17}', Set2: '{1, 2, 3, 4, 7, 10, 12, 16, 17, 18}'. How many elements are there in the union of Set1 and Set2 ?
Output (English): 15