public class Main {

	public static void main(String[] args) {
		String a = "12";
		String b = "x9";
		// TODO: 捕获异常并处理
		try {
			int c = stringToInt(a);
			int d = stringToInt(b);
			System.out.println(c * d);
		}catch(Exception e) {
			System.out.println(e);
		}
		
	}

	static int stringToInt(String s) {
		return Integer.parseInt(s);
	}
}