import java.io.*;
import java.math.*;

public class complex {

	/**
	 * @param args
	 */
	
	static double RealFirst = 0 ;
	static double ImaginFirst = 0 ;
	static double RealTwo = 0 ;
	static double ImaginTwo = 0 ;
	
	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		
		complexx value1 = new complexx()  ;
		complexx value2 = new complexx()  ;
		complexx valueResult = new complexx();
		
		Inputcomplex() ;//讀取復數函數
		
		value1.setcomplexRealOrImagin(RealFirst, ImaginFirst);
		value2.setcomplexRealOrImagin(RealTwo, ImaginTwo);

		valueResult.complexAdd(value1, value2);
		valueResult.complexSub(value1, value2); 
		valueResult.complexMul(value1, value2);
		valueResult.complexDiv(value1, value2);	
	}
	public static void Inputcomplex() throws IOException{
		
		System.out.println("****** Input the first complex ******");
		System.out.print("Input Real:"); 	
		BufferedReader cinRealFirst = new BufferedReader(new InputStreamReader(System.in));
		String cRealFirst = cinRealFirst.readLine();
		RealFirst = Double.parseDouble(cRealFirst);
		System.out.print("Input Imagin:"); 
		BufferedReader cinImaginFirst = new BufferedReader(new InputStreamReader(System.in));
		String cImaginFirst = cinImaginFirst.readLine();
		ImaginFirst = Double.parseDouble(cImaginFirst);
		
		System.out.println("****** Input the Two complex ******");
		System.out.print("Input Real:"); 
		BufferedReader cinRealTwo = new BufferedReader(new InputStreamReader(System.in));
		String cRealTwo = cinRealTwo.readLine();
		RealTwo = Float.parseFloat(cRealTwo);
		System.out.print("Input Imagin:"); 
		BufferedReader cinImaginTwo = new BufferedReader(new InputStreamReader(System.in));
		String cImaginTwo = cinImaginTwo.readLine();
		ImaginTwo = Float.parseFloat(cImaginTwo);
		System.out.println("*************result************");
	}
}

class complexx{

	
	private double RealRart ;
	private double ImaginPart ;
	
	complexx(){
		this.RealRart = 0 ;
		this.ImaginPart = 0 ;
	}
	complexx(double Real, double Imagin){
		this.RealRart = Real ;
		this.ImaginPart = Imagin ;
	}
	
	public  complexx complexAdd(complexx xx ,complexx yy){		
		
		complexx Result = new complexx();
		Result.RealRart = xx.getComplexxRealPart() + yy.getComplexxRealPart();
		Result.ImaginPart = xx.getComplexxImaginPart() + yy.getComplexxImaginPart();
		OutResult(Result);
		return Result ;
	}
	
	public  complexx complexSub(complexx xx ,complexx yy){
		
		complexx Result = new complexx();
		Result.RealRart = xx.getComplexxRealPart() - yy.getComplexxRealPart();
		Result.ImaginPart = xx.getComplexxImaginPart() - yy.getComplexxImaginPart();
		OutResult(Result);
		return Result ;
	}
	
	public complexx complexMul(complexx xx ,complexx yy){	
		
		complexx Result = new complexx();
		Result.RealRart = xx.getComplexxRealPart() * yy.getComplexxRealPart() - xx.getComplexxImaginPart() * yy.getComplexxImaginPart();
		Result.ImaginPart = xx.getComplexxRealPart() * yy.getComplexxImaginPart() + xx.getComplexxImaginPart() * yy.getComplexxRealPart();
		OutResult(Result);
		return Result ;
	}

	public complexx complexDiv(complexx xx ,complexx yy){
		
		complexx Result = new complexx();
		if(yy.getComplexxRealPart() == 0 && yy.getComplexxImaginPart() == 0){
			System.out.println("*****ERROR*****");
		}else{
			double complexSqrt = Math.sqrt(yy.getComplexxRealPart() * yy.getComplexxRealPart() + yy.getComplexxImaginPart() * yy.getComplexxImaginPart());
			Result.RealRart = (xx.getComplexxRealPart() * yy.getComplexxRealPart() + xx.getComplexxImaginPart() * yy.getComplexxImaginPart())/complexSqrt;
			Result.ImaginPart = (xx.getComplexxImaginPart() * yy.getComplexxRealPart() - xx.getComplexxRealPart() * yy.getComplexxImaginPart())/complexSqrt;
			OutResult(Result);
		}
		return Result ;
	}

	public void setcomplexRealOrImagin(double xX ,double yY){
		 this.RealRart = xX ;
		 this.ImaginPart =yY ;
	}
	
	public double getComplexxRealPart(){
		
		return this.RealRart;
	}
	public double getComplexxImaginPart(){
		
		return this.ImaginPart;
	}

	public void OutResult(complexx Result){

		if(Result.ImaginPart < 0){
			
			System.out.println("complexResult :" +Result.RealRart + " - " +(-Result.ImaginPart) + "i");
		}else if(Result.ImaginPart == 0){
			
			System.out.println("complexResult :" +Result.RealRart );
		}else if(Result.RealRart == 0){
				if(Result.ImaginPart < 0){
					System.out.println("complexResult :" + " + " + Result.ImaginPart + "i");
				}else{
					System.out.println("complexResult :" + Result.ImaginPart + "i");
				}
			
		}else{
			
			System.out.println("complexResult :" +Result.RealRart + " + " + Result.ImaginPart + "i");
		} 
	}
}