#include<iostream>
#include<cmath>
using namespace std;
int main(void)
{
int a,c,b,d;
char s;
cin>>a>>c>>s>>b>>d;
if(s=='+')
{
cout<<a+b;
if(abs(c+d)!=0)
cout<<(((c+d)>0)?'+':'-')<<abs(c+d)<<'i'<<endl;
}
else if(s=='-')
{
cout<<a-b;
if(abs(c-d)!=0)
cout<<(((c-d)>0)?'+':'-')<<abs(c-d)<<'i'<<endl;
}
return 0;
}
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