Task: Program Execution
Input (English): Set1: '{1, 2, 3, 7, 8, 12, 14, 16, 18}', Set2: '{2, 3, 7, 10, 13, 14, 15, 17, 18, 19}'. How many elements are there in the union of Set1 and Set2 ?
Output (English): 14