public class static1
{
public static void main(String[]L)

{

		if (L.length==0)
			System.err.println("Error!");

		else
		{
			if (L[0].equalsIgnoreCase("add") )
			{

				System.out.println("Ok you want to add");

			}

			else
			{
				if (L[0].equalsIgnoreCase("mult") )
				{

					System.out.println("Ok you want to mult");

				}

				else
					System.out.println("Error!");


			}
		}
}
}