When you access "nc qr-generator.ctf.defenit.kr 9000", It shows QR code for 100 times. The QR is generated by 0 and 1.
```I heard the QR devil made 100 stages.
What is your Hero's name? Thank you so much ** please escape from the QR devilLet's START!
< QR >1 1 1 1 1 1 1 0 1 0 1 0 0 0 1 1 1 1 1 0 1 1 0 0 0 1 1 1 0 1 1 1 0 1 0 0 1 0 1 1 1 1 1 1 1 1 0 0 0 0 0 1 0 1 0 0 0 1 1 1 0 1 1 1 1 1 0 0 1 1 1 1 1 0 1 0 1 0 0 0 1 0 0 1 0 0 0 0 0 1 1 0 1 1 1 0 1 0 1 1 0 0 1 1 0 0 0 0 0 0 0 0 1 1 0 0 1 0 1 1 0 0 1 1 0 1 0 0 1 0 1 1 1 0 1 1 0 1 1 1 0 1 0 0 1 1 0 0 0 0 0 0 1 0 1 1 1 1 0 0 0 1 0 1 0 0 1 0 0 0 1 1 0 1 0 1 1 1 0 1 1 0 1 1 1 0 1 0 0 1 0 0 1 0 1 0 1 0 1 1 1 1 1 1 1 1 1 0 0 1 1 0 0 1 1 1 1 0 1 0 1 1 1 0 1 1 0 0 0 0 0 1 0 1 1 1 1 0 0 0 1 1 0 0 0 1 0 0 0 1 1 0 0 0 1 0 1 1 0 0 0 0 0 1 0 0 0 0 0 1 1 1 1 1 1 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 1 1 0 0 1 1 1 1 0 1 1 0 0 0 1 0 1 1 1 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 1 1 1 1 1 0 1 0 1 1 0 1 0 0 0 0 1 1 1 1 1 1 0 0 0 0 1 1 0 0 0 1 1 1 0 1 0 0 1 1 1 1 0 0 1 1 1 0 1 0 0 1 1 1 0 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 0 0 0 1 1 1 0 0 0 0 0 1 0 1 0 1 0 1 0 0 1 0 1 0 1 0 0 1 1 0 1 1 1 0 1 0 0 0 1 0 0 1 0 1 0 1 0 1 0 0 0 0 1 1 1 1 1 1 1 1 0 1 0 0 0 1 0 0 0 0 1 0 0 1 0 0 1 1 0 1 1 0 1 1 0 0 0 0 0 0 0 1 0 1 1 1 1 1 1 0 1 0 0 0 0 1 1 1 1 0 0 0 1 1 1 1 0 1 0 0 0 1 0 0 0 0 0 0 0 0 1 0 1 0 0 0 1 1 1 1 0 1 1 0 1 1 1 0 1 0 0 0 1 0 1 1 1 0 0 0 0 1 0 0 0 1 1 1 1 0 1 0 0 0 0 0 0 0 1 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 1 0 0 0 0 1 1 1 0 0 1 1 1 1 1 0 1 0 1 1 1 0 0 1 0 0 1 0 1 1 1 0 1 0 0 0 1 1 0 1 0 0 1 1 1 1 1 1 1 0 1 0 0 1 1 1 1 1 1 0 1 0 0 0 0 0 1 0 1 1 1 1 1 1 1 0 1 1 0 0 0 1 1 0 0 1 1 0 0 0 1 0 1 1 1 0 1 0 1 1 0 1 0 0 1 0 1 0 1 0 1 0 1 0 1 1 0 1 1 0 0 0 1 0 1 0 1 0 1 1 0 0 1 0 1 1 1 0 0 0 1 0 0 0 1 1 1 0 0 1 1 0 1 0 0 0 1 1 0 0 0 0 1 0 0 1 1 0 1 1 1 0 1 0 1 0 1 0 0 0 0 1 0 0 0 1 1 1 1 0 0 0 1 0 1 0 1 1 0 1 1 0 1 1 1 1 1 0 1 0 1 0 1 1 0 0 1 0 1 1 1 0 1 0 1 0 0 1 0 0 0 0 0 0 0 1 1 0 1 0 1 0 0 1 1 1 0 1 1 0 0 1 0 0 0 1 0 1 0 1 0 1 1 0 0 1 0 0 1 0 1 1 1 1 1 1 1 1 1 0 1 0 1 1 1 0 1 1 1 0 1 1 1 1 1 1 1 0 1 1 1 0 1 1 0 1 1 1 1 1 1 1 0 1 1 1 1 0 1 1 0 0 0 1 1 1 1 1 0 1 1 1 0 0 1 1 0 0 0 1 0 0 1 0 1 1 1 0 0 0 1 1 0 0 0 1 1 1 0 1 0 1 1 1 1 0 1 0 1 1 0 0 1 1 0 0 1 0 0 0 1 0 1 0 1 1 1 1 1 1 1 1 1 0 1 1 1 0 1 0 1 0 0 1 1 1 1 0 0 1 0 0 0 1 0 0 1 0 1 0 1 0 1 0 0 1 0 0 0 1 1 1 1 1 1 0 0 1 0 1 1 1 0 0 0 1 1 0 0 0 0 0 1 0 1 1 1 1 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 0 0 0 0 1 0 0 0 0 0 0 1 1 1 1 1 1 0 0 1 0 1 0 0 0 0 0 1 0 0 0 1 0 1 0 1 0 1 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 0 0 1 0 1 1 1 1 0 0 1 0 0 1 1 1 1 0 1 0 0 0 0 0 0 0 1 0 0 0 1 0 1 0 1 0 0 1 1 0 1 1 1 0 0 1 1 0 1 0 0 0 1 0 1 0 0 1 1 0 0 0 0 0 1 0 0 0 1 0 0 0 1 1 1 0 1 0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 0 0 1 1 1 1 1 0 0 1 1 0 1 0 1 0 1 0 0 1 1 0 1 0 1 0 0 0 1 1 0 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 0 1 1 1 0 1 0 1 1 1 0 0 1 1 0 0 0 1 1 1 0 1 1 0 0 1 0 1 1 1 1 1 1 1 1 0 1 0 0 0 0 0 0 0 1 0 0 0 0 1 1 1 0 1 1 1 1 1 0 0 0 0 0 1 0 1 0 0 1 0 0 1 1 1 0 0 0 1 0 1 1 1 0 0 0 0 0 0 0 1 0 0 0 1 1 1 0 0 1 0 0 0 0 1 0 1 0 1 0 1 1 0 1 0 0 1 1 1 0 1 0 1 0 1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 1 1 0 0 1 0 1 1 1 0 1 1 1 0 0 1 1 1 1 0 1 0 1 0 1 1 0 0 1 1 0 0 1 1 1 0 1 1 1 0 1 0 1 0 1 1 0 1 1 0 1 0 0 0 1 0 1 0 1 1 1 0 1 1 0 0 1 0 0 0 1 0 1 0 1 1 0 0 1 0 1 0 1 1 0 1 1 1 0 0 0 0 0 0 1 0 1 1 0 0 0 0 1 0 1 0 1 0 1 1 1 0 1 1 1 0 1 0 0 0 0 0 0 0 1 0 0 0 1 0 1 0 1 1 0 0 1 1 1 1 0 0 0 1 1 0 1 0 1 0 1 0 0 0 0 0 1 0 0 1 0 0 1 1 0 0 1 1 1 1 1 1 1 1 0 1 0 0 0 1 1 0 0 1 1 0 1 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1 1 1 1 0 1 1 0 0 1 1 0 1 0 1 1 1 1 1 1 0 1 0 0 0 0 0 0 0 0 0 0 1 1 0 1 0 1 1 1 1 1 1 1 1 0 0 0 1 1 0 1 1 1 0 0 0 0 0 1 1 0 0 0 1 0 1 0 0 1 1 1 1 1 1 1 0 1 0 1 1 1 0 1 0 0 0 0 1 1 0 1 0 1 1 1 1 0 0 1 1 1 0 1 1 1 0 1 0 1 1 1 0 0 1 0 0 0 0 0 1 0 1 1 1 0 0 0 1 1 1 0 1 0 1 0 0 0 1 1 0 1 0 1 1 0 0 0 0 1 1 0 0 0 1 0 0 1 0 1 0 1 1 1 0 1 0 1 0 0 0 1 0 0 1 1 0 1 1 1 1 1 1 1 0 1 0 0 0 0 0 0 0 0 0 1 1 1 1 1 0 1 1 0 1 0 1 1 1 0 1 0 0 1 0 0 0 0 1 1 1 0 0 0 0 0 0 1 0 0 0 0 0 1 0 1 0 0 1 1 0 0 1 1 1 0 0 1 0 1 0 1 1 1 0 1 0 0 1 1 0 0 1 0 0 1 1 1 0 0 1 0 0 1 0 1 0 0 0 0 0 0 1 1 0 1 0 0 0 0 1 1 0 0 1 0 0 0 0 0 1 0 1 1 0 1 0 0 0 1 1 0 0 0 0 1 0 1 1 1 0 1 1 0 0 0 1 0 0 0 0 1 1 0 1 0 1 0 0 1 1 1 1 1 1 1 0 1 0 1 0 0 0 1 0 0 1 1 0 1 1 1 1 0 0 1 1 1 1 1 0 1 1 1 1 0 1 1 0 1 0 0 0 1 ```
I replaced 1 with "█" and 0 with " ". After that I converted to image file (png). lastly, I scanned the image, and sent the value.
```from pwn import *import argparsefrom PIL import Image, ImageDraw, ImageFontimport timeimport zxing
def qrdecode():    file_path = './img/qr_resize.png'    reader = zxing.BarCodeReader()    barcode = reader.decode(file_path)    return barcode.raw
def main():    ap = argparse.ArgumentParser()    ap.add_argument('host')    ap.add_argument('port', type=int)    args = ap.parse_args()    r = remote(args.host, args.port)    r.timeout = 20
    def check_recv(x):        data = r.recvuntil(x)        assert(x in data), ('Failed to recv {}'.format(repr(x)))        return data
    check_recv(b"What is your Hero's name?")    r.send(b'null2root\n')
    cnt = 0    while(True):        check_recv(b'< QR >')        data = check_recv(b'\n\n')
        def t2qr(x,xx,xy):            img = Image.new('RGB', (xx+40, xy+20), color = "white")            d = ImageDraw.Draw(img)            font = ImageFont.truetype('font/FreeMono.ttf')            line_spacing = d.textsize('█', font=font)[1]            text = x.decode('utf-8').replace(' ','').replace('1', '█').replace('0', ' ')            lines = text.split("\n")            y = 20            for line in lines:                d.text((20,y), line, fill="black", font=font)                y += line_spacing            img.save('./img/qr.png')            im = Image.open('./img/qr.png')            new_img = im.resize((350,350))            new_img.save('./img/qr_resize.png')
        x = len(data.decode('utf-8').split('\n')[1]) * 3        y = len(data.decode('utf-8').split('\n')) * 10        t2qr(data,x,y)        #print(cnt)        data = qrdecode()        r.sendline(data.encode('utf-8'))
        if(cnt>98):            r.interactive() # for Enter        cnt += 1
if __name__ == "__main__":    main()
```
Flag is Defenit{QQu!_3sC4p3_FR0m_D3v1l!_n1c3_C0gN1z3!}