import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Arrays;
 
 
public class Main {
	
	public static void main(String[] args) throws IOException {
		Main m = new Main();
		//*
		m.input();
		m.solve();
		m.output();
		/*/
		m.debug();
		//*/
	}
	
	public void debug() {
	}
	
	//*
	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	String S = null;
	char[] sex = null;
	/*/
	InputUtil in = new InputUtil();
	//*/
	PrintWriter out = new PrintWriter(System.out);
	int N = 0;
	boolean ans = false;
	
	public void input() throws IOException {
		N = Integer.parseInt(br.readLine());
		sex = new char[N+1];
	}
	
	public void solve() throws IOException {
		outputSub(0);
		inputSub(0);
		int s = 0;
		int e = N;
		if (sex[0] == 'V') {
			return;
		}
		for (int i=0; i<19; i++) {
			int m = getSearchSeatNo(s,e);
			outputSub(m);
			inputSub(m);
			if (sex[m] == 'V') {
				return;
			}
			if ((m-s)%2==0) {
				if (sex[s] != sex[m]) {
					e = m;
				} else {
					s = m;
				}
			} else {
				if (sex[s] == sex[m]) {
					e = m;
				} else {
					s = m;
				}
			}
		}
	}
	
	private void inputSub(int i) throws IOException {
		String tmp = br.readLine();
		sex[i] = tmp.charAt(0);
		if (i==0) {
			sex[N] = sex[0];
		}
	}
	
	private int getSearchSeatNo(int s, int e) {
		int eMinusS = e-s;
		if (eMinusS%2 == 0) {
			return s + eMinusS/2;
		} else {
			return s + (eMinusS-1)/2;
		}
	}
	
	private void outputSub(int i) {
		out.println(i);
		out.flush();
	}
	
	public void output() {
//		out.println(ans ? "Yes" : "No");
//		out.flush();
	}
}

//*
class InputUtil {
	//Static Fields
	private static final int BUFSIZ = 100000;
	
	//Fields
	protected InputStream in;
	private byte[] buf = null;
	private int ptr = 0;
	private int max = -1;
	private DataInputStream dis = null;
	//Constructors
	public InputUtil() {this(System.in,BUFSIZ);}
	public InputUtil(InputStream in, int bufsiz) {
		initBuf(bufsiz);
		initIn(in);
	}
	
	//Methods
	//Initializer
	protected void initIn(InputStream in) {dis = new DataInputStream(this.in = in);}
	protected void initBuf(int bufsiz) {buf = new byte[bufsiz];}
	
	//buffer operation
	private void next() throws IOException {ptr++; readBuf();}
	private void readBuf() throws IOException {
		if(ptr >= max && dis.available()>0) {
			if(max>0) Arrays.fill(buf,0,max,(byte)0);
			max = dis.read(buf);
			ptr = 0;
		}
	}
	
	//Number Input Reader/Parser
	private boolean isNum(byte b) {return '0' <= b && b <= '9'; }
	private boolean isMinus(byte b) {return b=='-'; }
 
	private int _nextInt() throws IOException {
		int sign = 1;
		int res = 0;
		byte c;
		while (!isNum(c=buf[ptr]) && !isMinus(c)) 
			next();
		if (isMinus(buf[ptr])) {
			sign = -1;
			next();
		}
		while (isNum(c=buf[ptr])) {
			res *= 10;
			res += c - '0' ;
			next();
		}
		next();
		return sign * res;
	}
	
	public int nextInt() throws IOException {
		readBuf();
		return _nextInt();
	}
 
	public int[] nextInt(int[] result) throws IOException {
		readBuf();
		for(int i=0; i<result.length; i++) {
			result[i] = _nextInt();
		}
		return result;
	}
	
	//Close 
	public void close() throws IOException {
		if(!this.in.equals(System.in)) 
			this.in.close();
	}
}
//*/


Measured memory_bytes: 23076