Code resolving chall ^3^```from PIL import Image
folder_broken = "./QuickFix/"
total_frame = 100
png_header = "89504e470d0a1a0a0000000d"jpg_header = "ffd8ffe000104a4649460000000d"
def fix_magic_bytes():	# image size 20x20 -> flag image after concat with size 20 * 100 x 20 *100	flag = Image.new('RGB',(2000,2000))
	for first in range(total_frame):		for second in range(total_frame):			fp_read = open("{}flag_{}_{}.jpg".format(folder_broken,first,second),"rb")			hex_file_broken = (fp_read.read()).encode("hex")
			hex_file_fixed  = hex_file_broken.replace(jpg_header,png_header)
			fp_write = open("temp.png","wb")			fp_write.write(hex_file_fixed.decode("hex"))			fp_write.close()
			img_open = Image.open("temp.png")			flag.paste(img_open,(first*20,second*20))
			fp_read.close()
	flag.save("flag.png")	print "[+] Open flag.png to get flag"		
if __name__ == '__main__':	fix_magic_bytes()```