Task: Program Execution
Input (English): 4, 12, ['x', '4563', '2435', 't', 'C', 'U', 'D', 'T', 's', '7853', '79', '9257', 'Z', '2455', 'm', 'h', '7417', '2907', '8435', 'x', 'O', 'K', '7947', '3273', '1039']
Output (English): t, h