Dwarves, Hats and Extrasensory Abilities
Contest: Codeforces Round 516 (Div. 1, by Moscow Team Olympiad)
Difficulty rating: 1900
Tags: binary search, constructive algorithms, geometry, interactive

This is an interactive problem.

In good old times dwarves tried to develop extrasensory abilities:

- Exactly n dwarves entered completely dark cave.
- Each dwarf received a hat — white or black. While in cave, none of the dwarves was able to see either his own hat or hats of other Dwarves.
- Dwarves went out of the cave to the meadow and sat at an arbitrary place one after the other. When a dwarf leaves the cave, he sees the colors of all hats of all dwarves that are seating on the meadow (i.e. left the cave before him). However, he is not able to see the color of his own hat and none of the dwarves can give him this information.
- The task for dwarves was to got diverged into two parts — one with dwarves with white hats and one with black hats.

After many centuries, dwarves finally managed to select the right place on the meadow without error. Will you be able to repeat their success?

You are asked to successively name n different integer points on the plane. After naming each new point you will be given its color — black or white. Your task is to ensure that the named points can be split by a line in such a way that all points of one color lie on the same side from the line and points of different colors lie on different sides. Moreover, no points can belong to the line. Also, you need to report any such line at the end of the process.

In this problem, the interactor is adaptive — the colors of the points in the tests are not fixed beforehand and the jury program can select them arbitrarily, in particular, depending on your program output.

Interaction format:
The first line of the standard input stream contains an integer n (1 ≤ n ≤ 30) — the number of points your program should name.

Then n times your program must print two integer coordinates x and y (0 ≤ x ≤ 109, 0 ≤ y ≤ 109). All points you print must be distinct.

In response to each coordinate pair your program will receive the string "black", if the point is black, or "white", if the point is white.

When all n points are processed, you need to print four integers x1, y1, x2 and y2 (0 ≤ x1, y1 ≤ 109, 0 ≤ x2, y2 ≤ 109) — coordinates of points (x1, y1) and (x2, y2), which form a line, which separates n points into black and white. Points (x1, y1) and (x2, y2) should not coincide.

Hacks

To hack solution use the following format. The first line must contain word "hack", the second line should contain the number n and the last line should contain the sequence of 0 and 1 — colors of points, which will be reported to the solution. Unlike the jury tests, colors of points in hacks are always fixed in advance. Of course, the hacked solution wouldn't be able to get the information about the colors in advance.

For example, the hack corresponding to sample test will look like this:

Constraints:
Time limit: 2.0 s
Memory limit: 256.0 MB

Note:
In the sample input and output values are aligned only for simplicity of interpreting them chronologically. In real interaction no "extra" line breaks should appear.

The following picture illustrates the first test.

Example input:
5
black
black
white
white
black

Example output:
0 0
3 1
2 3
4 4
0 2
1 3 4 1

Editorial:
The solution is just.. binary search!
We will use just a single line to put our points on. Let's maintain an invariant that all white colored points are on the left and all black colored on the right.
Put a new point in the middle of the gap between white points and black points.
Depending on the color said by jury shrink the gap to the left or to the right.
In the end draw a diagonal line between white points and black points.

The initializing binary search may look complicated but it isn't.
Put a first point on the leftmost (x = 0) position, suppose that this point is white (if it is black just revert all colors), and then play as if there is a white point in x = 0 and black point in x = 109.