Task: Program Execution
Input (English): 12, 13, ['2885', '3361', 'b', '5305', 'W', '1071', '5615', 'N', '6345', '4457', '9131', '6865', 'b', 'p', 'e', '1687', 'j', '3171', 'X']
Output (English): b6865