Task: Program Execution
Input (English): 17, 18, ['2857', 'S', 'y', 'Q', 'Y', '3155', 'Q', 'U', '519', '3867', '8149', '7457', '9073', 'T', '7585', 'S', 'I', '477', '7819', 'S']
Output (English): I, 477