#include "pch.h"
#include <iostream>
#include <string>
using namespace std;

class Node {
public:
	Node* next;
	string from;
	string to;
	int amount;
};

class list {
public:
	int len;
	Node* head;

	list();
	void add(string from, string to, int amount);
	Node* find(string from, string to);
};

list::list() {
	head = NULL;
	len = 0;
}

void list::add(string from, string to, int amount) {
	Node* same = find(from, to);
	if (same == NULL) {
		Node* node = new Node();
		node->from = from;
		node->to = to;
		node->amount = amount;
		node->next = this->head;
		this->head = node;
	}
	else
		same->amount += amount;
}

Node* list::find(string from, string to) {
	if (head == NULL) return NULL;
	Node* node = head;
	while (node->from != from || node->to != to) {
		node = node->next;
		if (node == NULL)
			break;
	}
	return node;
}

int hashh(string name) {
	int hashed = 1;
	for (int i = 0; i < name.length(); i+=2) {
		if (i + 1 < name.length()) {
			hashed += ((int)name[i] - (int)('_')) * ((int)name[i + 1] - (int)('_'));
		}
	}
	return hashed;
}

int main()
{
	char chr;
	string from, to;
	int amount, ind;
	list* tab[15000];
	for (int i = 0; i < 15000; i++) {
		tab[i] = new list();
	}
	while (cin >> chr) {
		if (chr == '+') {
			cin >> from >> to >> amount;
			ind = hashh(from);
			tab[ind]->add(from, to, amount);
		}
		else if (chr == '?') {
			cin >> from >> to;
			ind = hashh(from);
			Node* found = tab[ind]->find(from, to);
			if (found == NULL) cout << "NULL poszedł" << endl;
			else cout << found->amount << endl;
		}
	}
}