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

void DebugOutput(std::vector<std::vector<char>> &stacks)
{
	// DEBUG:
	for(const auto &st : stacks)
	{
		std::cout << "Stack: " << std::endl;
		for(const auto &ch : st)
			std::cout << "[" << ch << "]" << std::endl;
		std::cout <<  std::endl;
	}
}

std::vector<std::string> SplitStr(std::string str, const std::string &delim)
{
	std::vector<std::string> rtn;

	for(auto split = str.find(delim); split != std::string::npos; split = str.find(delim))
	{
		rtn.push_back(str.substr(0, split));
		str = str.substr(split + delim.size()); // chop off beginning
	}
	if(str.size())
		rtn.push_back(str);

	return rtn;
}

int main()
{
	std::ifstream ifs("data.txt");
	if(!ifs.is_open())
	{
		std::cerr << "Missing data.txt." << std::endl;
		return -1;
	}

	std::vector<std::vector<char>> stacks;

	// Step 1: Parse Starting Position
	for(std::string line; std::getline(ifs, line); )
	{
		if(line == "")
			break;

		stacks.resize((line.size() + 1) / 4);
		for(auto idx = 0; (idx * 4) < line.size(); ++idx)
			if(line[1 + idx * 4] != ' ')
				stacks[idx].push_back(line[1 + idx * 4]);
	}

	// Step 2: Clean up data:
	for(auto &st : stacks)
	{
		// clear out last line of each, seeing as how they're just index numbers:
		st.pop_back();
		// reverse list since we parsed top to bottom and inserted backwards...
		std::reverse(st.begin(), st.end());
	}

	// DebugOutput(stacks);

	// Step 3: Parse Actions
	for(std::string line; std::getline(ifs, line); )
	{
		if(line == "")
			continue;

		auto actions = SplitStr(line, " ");
		if(actions.size() != 6)
		{
			std::cerr << "Data corrupt: " << line << std::endl;
			exit(-1);
		}

		long amt = std::atoi(actions[1].c_str());
		long from = std::atoi(actions[3].c_str()) - 1;
		long to = std::atoi(actions[5].c_str()) - 1;

		for(auto i = 0; i < amt; ++i)
		{
			stacks[to].push_back(stacks[from].back());
			stacks[from].pop_back();
		}
	}

	// DebugOutput(stacks);

	for(const auto &st : stacks)
		std::cout << st.back();
	std::cout << std::endl;

	return 0;
}