import java.util.Scanner;

public class Main {
    
    public void getResult(String A) {
        String result = "";
        String[] temp = A.split(" ");
        double a = Integer.valueOf(temp[0]);
        double b = Integer.valueOf(temp[1]);
        double c = Integer.valueOf(temp[3]);
        double d = Integer.valueOf(temp[4]);
        if(temp[2].equals("+")) {
            a = a + c;
            c = b + d;
        } else if(temp[2].equals("-")) {
            a = a - c;
            c = b - d;
        } else if(temp[2].equals("*")) {
            double a1 = a;
            a = a*c - b*d;
            c = a1*d + b*c;
        } else if(temp[2].equals("/")) {
            double a1 = a;
            if(c*c + d*d == 0) {
                System.out.println("error");
                return;
            }
            a = (a*c + b*d) / (c*c + d*d);
            c = (b*c - a1*d) / (c*c + d*d);
        }
        if(!temp[2].equals("/")) {
            int a1 = (int) a;
            int c1 = (int) c;
            if(c1 >= 0) 
                result = result + a1 + "+" + c1 + "i";
            else
                result = result + a1 + c1 + "i";
        } else {
            if(c >= 0) 
                result = result + a + "+" + c + "i";
            else
                result = result + a + c + "i";
        }
        System.out.println(result);
    }
    
    public static void main(String[] args) {
        Main test = new Main();
        Scanner in = new Scanner(System.in);
        String A = in.nextLine();
        test.getResult(A);
    }
}