class Complex { private: int real; int imag;

public:
Complex(int r = 0, int i = 0)
{
    real = r;
    imag = i;

}

Complex(const string& s)
{
    int pos;
    pos = s.find('i');
    if(pos!= string::npos)
    {
        real = stoi(s.substr(0,pos-1));
        imag = stoi(s.substr(pos+1));
        if(s[pos-1] == '-')
        {
            imag = - imag;
        }
    }
}

Complex operator + (Complex const & Obj)
{
    Complex res;
    res.real = real + Obj.real;
    res.imag = imag + Obj.imag;
    return res;
}

void print() { cout << real << "+i" << imag << '\n'; }

}; int main() {

string s1, s2;
cin >> s1>>s2;

Complex c1(s1);
Complex c2(s2);

Complex c3 = c1 + c2;

c3.print();

return 0;

}