a,b

#include<iostream>
using namespace std;
struct complex
{
    double re;
    double im;
}z,x;
void citire(struct complex&z)
{
    cin>>z.re>>z.im;
}
void scriere (struct complex&z)
{
    if(z.im>0)
    {
        cout<<z.re<<"+"<<z.im<<"*i";
    }
    if(z.im<0)
    {
        cout<<z.re<<z.im<<"*i";
    }
    if(z.im==0)
    {
        cout<<z.re;
    }
}
int main ()
{
    citire(z);
    scriere(z);
    citire(x);
    scriere(x);
    int s=0,s1=0;
    if(x.re>=0&&x.im>=0&&z.re>=0&&z.im>=0)
    {
        s=x.re+z.re;
        s1=x.im+z.im;
    }
    cout<<s<<"+"<<s1<<"*i";
}