#include <iostream>

using namespace std;

class complex
{
public :
    int real, img;
};

int main()
{
    complex a, b, c;
    cout << "Enter a and b where a + ib is the first complex number.";
    cout << "\na = ";
    cin >> a.real;
    cout << "b = ";
    cin >> a.img;
    cout << "Enter c and d where c + id is the second complex number.";
    cout << "\nc = ";
    cin >> b.real;
    cout << "d = ";
    cin >> b.img;
    c.real = a.real + b.real;
    c.img = a.img + b.img;
    if ( c.img >= 0 )
        cout << "Sum of two complex numbers = " << c.real << " + " << c.img << "i";
    else
        cout << "Sum of two complex numbers = " << c.real << " " << c.img << "i";
    return 0;
}