#!/usr/bin/env python
import sys

if len(sys.argv) < 4:
   print "USAGE:t {0} inFile1 inFile2 outputFile".format(sys.argv[0])
   sys.exit()

fh1 = open(sys.argv[1], 'r')
fh2 = open(sys.argv[2], 'r')
fhO = open(sys.argv[3], 'w')

for r1, line1 in enumerate(fh1):

   fhO.write(line1)
   if r1 % 4 == 3:
      for r2 in xrange(4):
          fhO.write(fh2.readline())

fh1.close()
fh2.close()
fhO.close()