diff --git a/day21/sol.go b/day21/part1.go
similarity index 100%
rename from day21/sol.go
rename to day21/part1.go
diff --git a/day21/sol2.go b/day21/part2.go
similarity index 100%
rename from day21/sol2.go
rename to day21/part2.go
diff --git a/day21/sol.py b/day21/sat.py
similarity index 100%
rename from day21/sol.py
rename to day21/sat.py
diff --git a/day21/sol.sh b/day21/sol.sh
new file mode 100644
index 0000000..d02086d
--- /dev/null
+++ b/day21/sol.sh
@@ -0,0 +1,6 @@
+#!/bin/sh
+
+go run part1.go
+
+go run part2.go > expr.py
+python sat.py