//Server Program
import java.io.*;
import java.net.*;
public class mysender {
	public static void main(String args[])
	{
		try {
			ServerSocket ss=new ServerSocket(113);
			Socket s=ss.accept();
			DataInputStream dis=new DataInputStream(s.getInputStream());
			DataOutputStream dos=new DataOutputStream(s.getOutputStream());
			int p=Integer.parseInt(dis.readUTF());
			//int receivewindow=1;
			for(int i=0;i<p;i++)
			{
			String Str[]=new String[p];
			Str[i]=(String)dis.readUTF();
			System.out.println("Frame"+i+" is "+Str[i]);
			//System.out.println("Ack sent");
			dos.writeUTF("ACK");
			}
			ss.close();
		}catch(Exception e) {System.out.print(e);}
	}
}

//Client Program
import java.io.*;
import java.net.*;
import java.util.*;
public class myreceiver {
	public static void main(String args[])
	{
		try {
			Socket s=new Socket("localhost",113);
			DataOutputStream dout=new DataOutputStream(s.getOutputStream());
			DataInputStream di=new DataInputStream(s.getInputStream());
			Scanner sc=new Scanner(System.in);
			System.out.println("Enter the number of frames to be sent");
			int n=sc.nextInt();
			String k= Integer.toString(n);
			dout.writeUTF(k);
			String ack[]=new String[n];
			int sendwindow=0;
			System.out.println("Enter sendwindow size");
			sendwindow=sc.nextInt();
			for(int i=0,j=0;i<n/sendwindow;i++) {
				while(j<sendwindow) {
			System.out.println("enter frame"+j);
			String fr=sc.next();
			dout.writeUTF(fr);
			ack[i]=(String)di.readUTF();
			System.out.println(ack[i]);
			j++;
				}
				j=0;
			}
			dout.flush();
			dout.close();
			s.close();
			sc.close();
		}catch(Exception e) {System.out.println(e);}
	}

}