608

#include <iostream>
#include <stdio.h>
#include <map>
#include <string>

using namespace std;

int main()
{
    int n;
    scanf("%d", &n);
    map<string, int> bank;
    for(int i = 0; i < n; i++)
    {
        string sender, receiver;
        int amount;
        cin >> sender >> receiver >> amount;
        auto it = bank.find(sender);
        if (it == bank.end())
            bank.insert(pair<string, int> (sender, -amount));
        else
            it->second -= amount;
        it = bank.find(receiver);
        if (it == bank.end())
            bank.insert(pair<string, int> (receiver, amount));
        else
            it->second += amount;

    }
    auto it = bank.begin();
    for(it; it != bank.end(); it++)
    {
        cout << it->first << " " << it->second << endl;
    }



    system("pause");
    return 0;
}