Task: Program Execution
Input (English): 5, 6, ['7797', '5497', '351', 'L', 'Y', 'N', '8905', '3801', '3689', '7315', '3129', '781', '5283', 'U', 's', 'y', '3167', 'U', 'u', '9781', 't', '3427', 'U', 'Z', 't']
Output (English): NY