include

include

using namespace std;

int main() {

int k1, k2;
cin >> k1 >> k2;

map<int, int> poly1, poly2, result;

for (int i = 0; i < k1; i++) {
	int p, n;
	cin >> p >> n;
	poly1[n] = p;
}

for (int i = 0; i < k2; i++) {
	int p, n;
	cin >> p >> n;
	poly2[n] = p;
}

// 相加两个多项式的系数
for (auto& [exp, coeff] : poly2) {
	poly1[exp] += coeff; // 如果指数相同，累加系数
}

bool first = true;
for (auto& [exp, coeff] : poly1) {
	if (coeff != 0) { // 只输出系数不为0的项
		if (!first)
			cout << "+"; // 非第一项输出加号
		cout << coeff << "x^" << exp;
		first = false;
	}
}

cout << endl;
return 0;

}