Update README.md

Author: josemoracard

exercises/27-sequence-of-words/README.md

@@ -9,11 +9,15 @@
 ## 📎 Example input:
 
 ```py
-sequence_of_words(without,hello,bag,world)
+sequence_of_words("without,hello,bag,world")
 ```
 
 ## 📎 Example output:
 
 ```py
 bag, hello, without, world
 ```
+
+## 💡 Hint:
+
++ Remember that each word must be separated by a comma and inside one pair of quotes.