#!/usr/bin/python

import os, sys
import glob

stext = sys.argv[1]
rtext = sys.argv[2]
path = sys.argv[3]
input = sys.stdin
output = sys.stdout
files = glob.glob(path)
for file in files:

  input = open(file)
  output = open(file + '_copy', 'w')
  for s in input.xreadlines(  ):
      output.write(s.replace(stext, rtext))
  output.close(  )
  input.close(  )