Task: Program Execution
Input (English): 12, ['3171', '2535', 'g', 'C', '9537', '999', '489', '6303', 'W', 'g', '7689', 'j', '6369', 'I', '509', '9891', '2569', 'R', '1111', '31', 'f', '9393', 's', '5907', 'D', '3059', '943']
Output (English): 3171, 6369, D