#!/usr/bin/python3

from binascii import unhexlify
import sys

data = bytearray()
if len(sys.argv) == 2:
     F = open (sys.argv[1], "rb")
     data = F.read()
     F.close

End = len(data)
begin=b'0\x81'

i = 0
j = 3
found = False
Email = bytearray()
while i < End and not found:
     if data[i] != begin[1]:
          i += 1
     else:	  
          Start = i
          if (data[i-2] == begin[0]) :
               LENGTH = data[i+1]
               Email.extend(data[Start+2:Start+2+LENGTH])
               print(str(Email.decode()))
               found = True
          else:
               i += 1