Task: Program Execution
Input (English): 13, 14, ['C', '4655', '3497', 'G', '6807', '7777', 'Y', '3475', '8851', '7441', '5651', '9133', '9041', 'X', '6357', 'b', 'T', 'N', '8833', '8479', '7885', '593', 'T', 'B']
Output (English): X9041