diff --git a/21/a21c6a11d8a84dbd46ed8b458c6e25f4c1854c b/21/a21c6a11d8a84dbd46ed8b458c6e25f4c1854c
new file mode 100644
index 00000000000..4675c765421
--- /dev/null
+++ b/21/a21c6a11d8a84dbd46ed8b458c6e25f4c1854c
@@ -0,0 +1 @@
+Author: https://github.com/Hendiadyoin1