Task: Program Execution
Input (English): 18, 20, ['f', '4717', 's', 'v', 'w', '5543', 'p', '1091', 'j', 'X', 'h', 'J', '1681', '1565', 'C', '6771', '7909', 'P', 'Y', 'r', 'M']
Output (English): P, Y, r