use std::env;

fn escapes(cr: f64, ci: f64, it: u32) -> char {
    let mut zr = 0.0 as f64;
    let mut zi = 0.0 as f64;
    let mut zrtmp: f64;
    
    for _i in 0..it {
        zrtmp = zr*zr - zi*zi + cr;
        zi = 2.0*zr*zi + ci;
        zr = zrtmp;
        if zr*zr + zi*zi > 4.0 {
            return ' ';
        }
    }
    return 'X';
}

fn main() {
    let xmin = -2.0 as f64;
    let xmax = 1.0 as f64;
    let ymin = -1.0 as f64;
    let ymax = 1.0 as f64;
    
    let args: Vec<String> = env::args().collect();
    let xstep = args[1].parse::<u32>().unwrap();
    let ystep = args[2].parse::<u32>().unwrap();
    let iters = args[3].parse::<u32>().unwrap();

    let mut x: f64;
    let mut y: f64;
    for yc in 0..ystep {
        y = (yc as f64) * (ymax - ymin) / (ystep as f64) + ymin;
        for xc in 0..xstep {
            x = (xc as f64) * (xmax - xmin) / (xstep as f64) + xmin;
            print!("{}", escapes(x, y, iters));
        }
        println!();
    }
}