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diff --git a/challenge-266/steven-wilson/python/ch-1.py b/challenge-266/steven-wilson/python/ch-1.py
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+++ b/challenge-266/steven-wilson/python/ch-1.py
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+#!/usr/bin/env python3
+
+from collections import Counter
+
+
+def uncommon_words(*sentences):
+    ''' Given  two sentences, find all uncommmon words in any order in the
+    given two sentences. Return ('') if none found.  A word is uncommon if it
+    appears exactly once in one of the sentences and doesn’t appear in other
+    sentence.
+
+    >>> uncommon_words('Mango is sweet', 'Mango is sour')
+    ['sweet', 'sour']
+    >>> uncommon_words('Mango Mango', 'Orange')
+    ['Orange']
+    >>> uncommon_words('Mango is Mango', 'Orange is Orange')
+    ['']
+    '''
+    if not sentences:
+        raise TypeError('Provide at least one sentence.')
+
+    counter = Counter(word for sentence in sentences for word in sentence.split())
+    uncommon = [word for word, count in counter.items() if count == 1]
+    return uncommon if uncommon else ['']
+
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod(verbose=True)