11507 - Bender B. Rodríguez Problem

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;
import java.util.StringTokenizer;

class Reader {
	static BufferedReader reader;
	static StringTokenizer tokenizer;

	/** call this method to initialize reader for InputStream */
	static void init(InputStream input) {
		reader = new BufferedReader(new InputStreamReader(input));
		tokenizer = new StringTokenizer(" ");
	}

	/** get next word */
	static String next() throws IOException {
		while (!tokenizer.hasMoreTokens()) {
			// TODO add check for eof if necessary
			tokenizer = new StringTokenizer(reader.readLine());
		}
		return tokenizer.nextToken();
	}

	static String nextLine() throws IOException {
		return reader.readLine();
	}

	static int nextInt() throws IOException {
		return Integer.parseInt(next());
	}

	static double nextDouble() throws IOException {
		return Double.parseDouble(next());
	}

	static long nextLong() throws IOException {
		return Long.parseLong(next());
	}
}

public class Main {
	static Map<String, String> map;
	static {
		map = new HashMap<String, String>();

		// positive values
		map.put("+x +y", "+y");
		map.put("+x -y", "-y");
		map.put("+x +z", "+z");
		map.put("+x -z", "-z");
		map.put("+y +z", "+y");
		map.put("+y -z", "+y");
		map.put("+y +y", "-x");
		map.put("+y -y", "+x");
		map.put("+z -y", "+z");
		map.put("+z +y", "+z");
		map.put("+z +z", "-x");
		map.put("+z -z", "+x");

		// negative values
		map.put("-x +y", "-y");
		map.put("-x -y", "+y");
		map.put("-x +z", "-z");
		map.put("-x -z", "+z");
		map.put("-y +z", "-y");
		map.put("-y -z", "-y");
		map.put("-y +y", "+x");
		map.put("-y -y", "-x");
		map.put("-z -y", "-z");
		map.put("-z +y", "-z");
		map.put("-z +z", "+x");
		map.put("-z -z", "-x");
	}

	public static void main(String[] args) throws Exception {

		Reader.init(System.in);
		int x = -1;
		String init = "+x";
		String reader = "";
		String arr[]  = null;
		StringBuffer sb = new StringBuffer();
		while ((x = Reader.nextInt()) != 0) {
			init = "+x";
			--x;
			arr = new String[x];
			reader = Reader.nextLine();
			//System.out.println(reader);
			arr = reader.split(" ");
			for(int i=0;i<arr.length;i++){
				if(!arr[i].equals("No"))
					init = map.get(init + " " +arr[i]);
			}
			sb.append(init + "\n");
		}
		System.out.print(sb.toString());
	}
}