#!/usr/bin/python

import sys,getopt

with open(sys.argv[1],"rb") as f:
        block = f.read(6)
        str = ""
        for ch in block:
                str += hex(ord(ch))+" "
        print str
        if str == '0xff 0xd8 0xff 0xdb 0x0 0x84 ':
            print "pixel knot header detected!!!"
        else:
            print "knot a match"