Task: Program Execution
Input (English): 17, 18, ['6775', 'M', 'W', 'u', '7721', '4393', 'J', 't', '7769', '897', '2501', '1535', 'W', 'Z', '2563', '1159', '9009', 'l', '6483', 'F', 'I', 'M', 'r', 'X']
Output (English): l9009