Task: Program Execution
Input (English): 23, 24, ['4865', '727', '8671', '563', 'R', '739', '529', 'D', 'h', 'c', '7327', 'K', 'X', 'i', 'x', 'y', 'n', '4833', 'U', '7951', '3283', 'h', 'X', 'Z', '8225']
Output (English): ZX