Task: Program Execution
Input (English): Set1: '{1, 2, 5, 6, 8, 11, 13, 14, 17, 19}', Set2: '{1, 4, 7, 8, 10, 11, 13, 14, 15}'. How many elements are there in the union of Set1 and Set2 ?
Output (English): 14