added print-out

s1_a53_6.py

@@ -6,7 +6,7 @@ if __name__ == "__main__":
     # 5.4
     def remove_duplicates(word: str):
         return "".join(sorted(set(word), key=word.index))
-    remove_duplicates("Donaudampfschiffahrtsgesellschaftsstewardess")
+    print(remove_duplicates("Donaudampfschiffahrtsgesellschaftsstewardess"))
 
     # 5.5
     nums = [[1, 2, 3], [2, 1, 3], [4, 0, 1]]