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

using namespace std;

class Node {
	char _name;
	vector<Node*> _linkedNodes;
	vector<char> _edges;
  public:
	Node();
	Node(char name);
	void linkNode(Node* linkedNode);
};

Node::Node(char name) {
	_name = name;
}

void Node::linkNode(Node* linkedNode) {
	_linkedNodes.push_back(linkedNode);
}


int main() {
	ostringstream output;
	vector<Node*> nodes;
	while (true) {
		cout << "graphprog> ";
		string cmd;
		char node1, node2, edge;
		cin >> cmd;
		if (cmd == "add") {
			cin >> edge >> node1 >> node2;	
			output << edge << " " << node1 << " " << node2 << endl;
		}
		else if (cmd == "write") {
			string outfileName;
			cin >> outfileName;
			ofstream outfile(outfileName.c_str());
			outfile << output.str();
		}
		else if (cmd == "show") {
			cout << output.str();
		}
		else if (cmd == "quit") {
			break;
		}
	}
	return 0;
}

void addNodes(vector<Node*>* nodes, char edge, Node * node1, Node * node2) {
	nodes.push_back(new Node(node1));
	nodes.push_back(new Node(node2));
}