1 files changed, 4 insertions, 0 deletions
diff --git a/python/problems/introduction/fahrenheit_to_celsius/common.py b/python/problems/introduction/fahrenheit_to_celsius/common.py
index 6549c32..918c643 100644
--- a/python/problems/introduction/fahrenheit_to_celsius/common.py
+++ b/python/problems/introduction/fahrenheit_to_celsius/common.py
@@ -3,6 +3,7 @@
 from python.util import has_token_sequence, string_almost_equal, \
     string_contains_number, get_tokens, get_numbers, get_exception_desc
 from server.hints import Hint
+import re
 
 id = 180
 group = 'introduction'
@@ -87,6 +88,9 @@ def hint(python, code):
     if not has_token_sequence(tokens, ['input']):
         return [{'id': 'no_input_call'}]
 
+    if not re.findall(r'=[^\n]*?input', code):
+        return [{'id': 'no_input_call'}]
+
     # if tokens * or / or = are not in code, we have to teach them how to 
     # evaluate expressions.
     if (not has_token_sequence(tokens, ['/']) or