diff --git a/mypy/plugins/enums.py b/mypy/plugins/enums.py
index de58e5d..269843a 100644
--- a/mypy/plugins/enums.py
+++ b/mypy/plugins/enums.py
@@ -27,10 +27,9 @@
     LiteralType,
     ProperType,
     Type,
+    UnionType,
     get_proper_type,
     is_named_instance,
-    UnionType,
-    LiteralType,
 )
 
 ENUM_NAME_ACCESS: Final = {f"{prefix}.name" for prefix in ENUM_BASES} | {
@@ -65,7 +64,9 @@
 
     # Or `field: SomeEnum = SomeEnum.field; field.name` case,
     # Or `field: Literal[Some.A, Some.B]; field.name` case:
-    enum_names = _extract_enum_names_from_type(ctx.type) or _extract_enum_names_from_literal_union(ctx.type)
+    enum_names = _extract_enum_names_from_type(ctx.type) or _extract_enum_names_from_literal_union(
+        ctx.type
+    )
     if enum_names:
         str_type = ctx.api.named_generic_type("builtins.str", [])
         return make_simplified_union(