#include <iostream>
#include <algorithm>
#include <map>
#include<string>
#include<iomanip>

using namespace std;


int main()
{
	int n, amount;
	cin >> n;
	string name1, name2;
		map <string, int> clients;

	for (int i = 0; i < n; i++)
	{
		cin >> name1 >> name2 >> amount;
		clients[name1] -= amount;
		clients[name2] += amount;
	}

	map <string, int>::iterator cur;


	for (cur = clients.begin(); cur != clients.end(); cur++)
	{
		cout<< (*cur).first << " " << (*cur).second << endl;
	}


	system("pause");
	return 0;
}