import java.io.*;
import java.text.*;
//
//Switch Statement and File Input and Output (I/O)
//Program has a bug.  Can you spot it?
//

public class switch_io
{
	static final int MAX=10;
	static String names []=new String[MAX];
	static int scores []=new int[MAX];//allocate memory
	static int num_records=0;

 	public static void Read(String infilename) throws IOException
        {
                BufferedReader in=new BufferedReader
                (new FileReader(infilename));
		int count=0;//local variable
		try
		{
                	while(count<names.length)
                	{
               			names[count]=in.readLine();
				scores[count]=
				Integer.parseInt(in.readLine());
				count++;
			 }
        	}
		catch (NumberFormatException e)
		{
			System.out.println("There were "+count+
			" records read in.");
		}
		num_records=count;
	}

	public static void Write(String outfilename) throws 
		IOException
	{
	//precondition: filename is passed in
	//postcondition: values are written to the file
		PrintWriter out= new PrintWriter
		(new FileWriter(outfilename));

		for (int count=0;count<num_records;count++)
		{
			out.print(names[count]+'\t');
			switch(scores[count])
			{
				case 10: 
				case 9:	out.println('A');
					break;
				case 8: out.println('B');
					break;
				case 7: out.println('C');
					break;
				case 6: out.println('D');
					break;
				case 5:
				case 4:
				case 3:
				case 2:
				case 1: out.println('F');
			default: out.println("Uh Oh program broke!");
			}//end of switch
		}//end of for	
		out.close();
	}//end of function

	public static void main(String[] args) throws IOException
	{
		String infilename, outfilename;

		//create input stream object to read from keyboard
		BufferedReader in=new BufferedReader
		   (new InputStreamReader(System.in));

		System.out.print("Please enter the input filename: ");
			infilename=in.readLine();
		System.out.print("Please enter the output filename: ");
			outfilename=in.readLine();
		Read(infilename);
		Write(outfilename);
		System.out.println("Data written the file: "+
		outfilename+'\n');
	}

}