import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class Message
{

	 public static void main (String[] args) throws IOException {

	        // a new BufferedReader to load .txt's
		    Scanner scanner = new Scanner(System.in);

		 	BufferedReader brUser = new BufferedReader(new FileReader("merged.txt"));
	        Map<String, String> map = new HashMap<String, String>();

	        // Read username.txt line by line
	        for(String line; (line = brUser.readLine()) != null;) {
	           String[] s = line.split(" ");
	           map.put(s[0], s[1]);
	        }
	        brUser.close();
	        System.out.println("Enter username (exit to stop)");
	        String value = scanner.nextLine();
	        while(!"exit".equals(value))
	        {
	        	if(map.containsKey(value))
	        	{
	        		System.out.println("Message: " + map.get(value));
	        	}
	        	else if(!map.containsKey(value))
	        	{
	        		System.out.println("User does not exist");
	        	}
	        	value = scanner.nextLine();


	        }
	        scanner.close();
	 }
}