import 'dart:io';

final double xmin = -2.0;
final double xmax = 1.0;
final double ymin = -1.0;
final double ymax = 1.0;

String escapes(cr, ci, it) {
  double zr = 0.0;
  double zi = 0.0;
  double zrtmp;
  int i;
  
  for(i=0; i<it; i++) {
    // z <- z^2 + c
    zrtmp = zr*zr - zi*zi + cr;
    zi = 2*zr*zi + ci;
    zr = zrtmp;
    if (zr*zr + zi*zi > 4) {
      return ' ';
    }
  }
  return 'X';
}
  
void main(List<String> arguments) {
  int xstep = int.parse(arguments[0]);
  int ystep = int.parse(arguments[1]);
  int iters = int.parse(arguments[2]);
  double x, y;
  int xc, yc;
  for(yc=0; yc<ystep; yc++) {
    y = yc*(ymax-ymin)/ystep + ymin;
    for(xc=0; xc<xstep; xc++) {
      x = xc*(xmax-xmin)/xstep + xmin;
      stdout.write(escapes(x, y, iters));
    }
    stdout.write('\n');
  }
}