// linedrawing.cpp : Defines the entry point for the console application.
//

#include <math.h>
#include <iostream.h>

#define ROWS 20
#define COLS 50

class FrameBuffer {
	private:
	char buf[ROWS][COLS];

	public:
	FrameBuffer::FrameBuffer(void) {
		clear();
	}

	void FrameBuffer::clear() {
		int x, y;

		for (y=0; y<ROWS; y++) {
			for (x=0; x<COLS; x++) {
				buf[y][x] = '.';
			}
		}
	}

	void FrameBuffer::drawLine(int x1, int y1, int x2, int y2) {
		float x, y;
		float m;
		float xinc, yinc;
		int i, j;
		int done;

						// If in quadrants 5-8, then reverse order to 
						// switch to quadrants 1-4
		if (y2 < y1) {
			int tx = x1;
			int ty = y1;
			x1 = x2;
			y1 = y2;
			x2 = tx;
			y2 = ty;
		}

						// First compute increments
		if (x1 != x2) {
 			m = (float)fabs(((float)(y2 - y1)) / (float)(x2 - x1));
			if (m <= 1.0f) {
						// Octants 1, 4
				xinc = (x2 < x1) ? -1.0f : 1.0f;
				yinc = m;
			} else {
						// Octants 2, 3
				yinc = (y2 < y1) ? -1.0f : 1.0f;
				xinc = 1.0f / m * ((x2 < x1) ? -1.0f : 1.0f);
			}
		} else {
						// Vertical lines
			xinc = 0.0f;
			yinc = 1.0f;
		}

						// Then loop painting point
		x = (float)x1;
		y = (float)y1;
		done = 0;
		do {
			i = (int)(x + 0.5f);
			j = (int)(y + 0.5f);
			buf[j][i] = 'X';
			x += xinc;
			y += yinc;
			if ((i == x2) && (j == y2)) {
				done = 1;
			}
		} while (!done);
	}

	void FrameBuffer::print() {
		int x, y;

		for (y=0; y<ROWS; y++) {
			for (x=0; x<COLS; x++) {
				cout << buf[y][x];
			}
			cout << "\n";
		}
	}
};

int main(int argc, char* argv[])
{
	int x1, y1, x2, y2;
	FrameBuffer fb;

	while (true) {
                cin >> x1;
                if (x1 == -1)
                    break;
		cin >> y1 >> x2 >> y2;
		fb.drawLine(x1, y1, x2, y2);
	}

	fb.print();

	return 0;
}