//Operator Overloading

#include<iostream>

using namespace std;

class Complex
{
public:
    int a,b;
    void input(string s)
    {
        int v1=0;
        int i=0;
        while(s[i]!='+')
        {
            v1=v1*10+s[i]-'0';
            i++;
        }
        while(s[i]==' ' || s[i]=='+'||s[i]=='i')
        {
            i++;
        }
        int v2=0;
        while(i<s.length())
        {
            v2=v2*10+s[i]-'0';
            i++;
        }
        a=v1;
        b=v2;
    }
};

Complex operator+(Complex c1, Complex c2){
    Complex c;
    c.a = (c1.a + c2.a);
    c.b = (c1.b + c2.b);
    return c;
}

//b) Operator << should print a complex number in the format "a+i
std::ostream& operator << (std::ostream &outS, Complex cn){
    outS << cn.a << "+i"<< cn.b << std::endl;
    return outS;
}

int main()
{
    Complex x,y;
    string s1,s2;
    cin>>s1;
    cin>>s2;
    x.input(s1);
    y.input(s2);
    Complex z=x+y;
    cout<<z<<endl;
}