07. Miners

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

using namespace std;

int main() {
    string resource;
    getline(cin, resource);

    list<pair<string, int>> resources;

    int quantity;

    while (resource != "stop") {
        cin >> quantity;
        bool isresource = false;

        for (auto& r : resources) {
            if (r.first == resource) {
                r.second += quantity;
                isresource = true;
                break;
            }
        }

        if (!isresource) {
            resources.push_back(make_pair(resource, quantity));
        }

        cin.ignore();
        getline(cin, resource);
    }

    for (auto &r : resources) {
            cout << r.first << " -> " << r.second << endl;
    }

    return 0;
}