//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 t1,Complex t2){
Complex c;
c.a=t1.a+t2.a;
c.b=t1.b+t2.b;
return c;
}
ostream &operator <<(ostream &out, Complex &c1){
out<<c1.a<<"+i"<<c1.b;
return out;
}
//Overload operators + and << for the class complex
//+ should add two complex numbers as (a+ib) + (c+id) = (a+c) + i(b+d)
//<< should print a complex number in the format "a+ib"
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;
}