#include <iostream>
#include <vector>
#include <map>
#include <string>
#include <sstream>

using namespace std;

map<int, int> multiplyPolynomials(const vector<pair<int, int>>& poly1, const vector<pair<int, int>>& poly2) {
    map<int, int> result;  
    for (const auto& term1 : poly1) {
        int exp1 = term1.first;
        int coeff1 = term1.second;

        for (const auto& term2 : poly2) {
            int exp2 = term2.first;
            int coeff2 = term2.second;

            int newExp = exp1 + exp2; 
            int newCoeff = coeff1 * coeff2; 

            result[newExp] += newCoeff; 
        }
    }

    return result;
}

string formatPolynomial(const map<int, int>& poly) {
    stringstream ss;
    bool firstTerm = true;

    for (auto it = poly.rbegin(); it != poly.rend(); ++it) { 
        int exp = it->first;
        int coeff = it->second;

        if (coeff == 0) {
            continue;  
        }

        if (!firstTerm&&coeff > 0 ) {
            ss<<'+';
        }
        firstTerm = false;

        if (exp == 0) {
            ss << coeff;  
        } else if (coeff == 1) {
            ss << "x^" << exp; 
        } else if (coeff == -1) {
            ss << "-x^" << exp;  
        } else {
            ss << coeff << "x^" << exp;  
        }
    }

    return ss.str();
}

int main() {
    freopen("mul.in","r",stdin);
    freopen("mul.out","w",stdout);
    vector<pair<int, int>> poly1, poly2;
    int exponent, coefficient;
    while(true){
        cin >> exponent;
        if (exponent == -1&&getchar()!=' ') break;
        cin >> coefficient;
        poly1.emplace_back(exponent, coefficient);
    }
    while (true) {
        cin >> exponent;
        if (exponent == -1&&getchar()!=' ') break;
        cin >> coefficient;
        poly2.emplace_back(exponent, coefficient);
    }
    map<int, int> result = multiplyPolynomials(poly1, poly2);
    cout << formatPolynomial(result) << endl;

    return 0;
}

answer.code:9:61: error: '>>' should be '> >' within a nested template argument list
 map<int, int> multiplyPolynomials(const vector<pair<int, int>>& poly1, const vector<pair<int, int>>& poly2) {\x0d
                                                             ^
answer.code:9:98: error: '>>' should be '> >' within a nested template argument list
 map<int, int> multiplyPolynomials(const vector<pair<int, int>>& poly1, const vector<pair<int, int>>& poly2) {\x0d
                                           ...