import java.io.*;
import java.lang.*;
import java.util.*;

class ReadEvents
{
 public static void main(String[] args) {
	try{
		  FileReader in = new FileReader(args[0]);
		  BufferedReader EventFile = new BufferedReader(in);	 // read the first Event from the input file

		  FileOutputStream printToFile = new FileOutputStream("mails.txt");
		  PrintStream out = new PrintStream(printToFile);
		 
		  String CurrentEvent = EventFile.readLine();
		  String field;
		  StringTokenizer extractor;
		  boolean sending = true;
		  int SumOfTime = 0;
		  int NumberOfEvents = 0;

		  if (CurrentEvent == null) return; // empty file, exit
		  CurrentEvent = EventFile.readLine();	// skip the first line

		  // output the header 
		  out.print("event_id" + "  ");
		  out.print("event_type" + "     ");
		  out.print("time" + "     ");
		  out.print("receiver_id" + "     ");
		  out.print("sender_id" + "    ");	
		  out.print("priority" + "     " + '\t');
		  out.println("message");

		           
		  // Read and process every Event
		  while (CurrentEvent!=null) {
			  // use tokenizer to extract each field in a Event
			  extractor = new StringTokenizer(CurrentEvent, " \t\n");
			  field = extractor.nextToken();	// extract the first field event_id
			  out.print(field + " " + '\t' + " ");
  			  field = extractor.nextToken();	// extract the second field event_type
			  out.print(field + " " + '\t' + " ");

			  if (field.charAt(0) == 'R')	// determine if it is a sending event
				  sending = false;
			  else sending = true;

  			  field = extractor.nextToken();	// extract the third field time
			  out.print(field + " " + '\t' + " ");
			  SumOfTime += Integer.parseInt(field); // Sum up all arrival times
			  NumberOfEvents++;

  			  field = extractor.nextToken();	// extract the fourth field receiver_id
			  out.print(field + "  " + '\t');

			  if (sending)
			  {
				   field = extractor.nextToken(); // extract the fifth field sender_id
				   out.print(field + "  " + '\t');
				   field = extractor.nextToken(); // extract the sixth field priority
				   out.print(field + " " + '\t');
				   // print the message field
				   out.print(extractor.nextToken());
				   while (extractor.hasMoreTokens()) 
					   out.print(" " + extractor.nextToken());
				   out.println();
			  }
			  else out.println();
			  CurrentEvent = EventFile.readLine();	// read the next Event
		  }
		  out.println("Average event time: " + SumOfTime/NumberOfEvents);
		  in.close();
		  EventFile.close();
	}
	// input file must be well-formated
	catch (NumberFormatException e){
		System.out.println("Event format errors in input file");
	}
	// I/O errors
	catch (IOException e){
		System.out.println("Unable to read input file");
	}
}
}