import java.io.*;
 
class Main{
	public static void main(String[] args) throws IOException{
		byte[] ba = {127,-1,-1,-1};
		PipedInputStream pis = new PipedInputStream();
		PipedOutputStream pos = new PipedOutputStream();
		//DataOutputStream dos = new DataOutputStream(pos);
		DataInputStream dis = new DataInputStream(pis);
		pis.connect(pos);
		// dos.write(ba,0,ba.length);
		pos.write(ba,0,ba.length);
		int x = dis.readInt();
		System.out.println(x);
 
 
	}
}

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