include

using namespace std;

struct Com {

int a;
int b;
Com *next;

};

Com create(int a, int b); void add(Com &head, int a, int b); Com sum(Com *head);

int main() {

Com *head = nullptr;
int a, b;

for (int i = 0; i < 10; ++i)
{
    cin >> a >> b;
    add(head, a, b);
}

Com result = sum(head);

cout << result.a << "+" << result.b << "i" << endl;

return 0;

}

Com *create(int a, int b) {

Com *c = new Com;
c->a = a;
c->b = b;
c->next = nullptr;
return c;

}

void add(Com *&head, int a, int b) {

if (head == nullptr)
{
    head = create(a, b);
}
else
{
    Com *current = head;
    while (current->next != nullptr)
    {
        current = current->next;
    }
    current->next = create(a, b);
}

}

Com sum(Com *head) {

Com sum = {0, 0, nullptr};
Com *current = head;

while (current != nullptr)
{
    sum.a += current->a;
    sum.b += current->b;
    current = current->next;
}

return sum;

}