Task: Program Execution
Input (English): 4, 5, ['8775', '5715', '9435', 'f', '4873', '3775', '8793', 'l', 'F', '6315', 'O', 'o', '8853', '2499', 'v', 'G', 'k', '3171', '5423', '3433', 'n', 'U']
Output (English): f4873