syntax error?

[Culm]

Newbie -- trying to learn python on mac. Installed v2 and v3. -- tried to run the following script from terminal:

#!/usr/bin/python
# -*- coding: latin-1 -*-
import os, sys

f = open(‘CROSSWD.TXT’, 'r+')
for line in f:
	word=line.strip()
	if len(word)>20:
		print word

this is the error message I get:

Error:
  File "ppp.py", line 5
    f = open(?CROSSWD.TXT?, 'r+')
             ^
SyntaxError: invalid syntax

(the symbol ^ appears under the first question mark -- this post has altered the position)
No problem running it from the interpreter
Thanks in advance