diff --git a/sevenkeys/main.go b/sevenkeys/main.go
index 67821f5..952d82c 100644
--- a/sevenkeys/main.go
+++ b/sevenkeys/main.go
@@ -2,8 +2,15 @@ package main
 
 import (
 	"fmt"
+	"log"
 )
 
+func check(err error) {
+	if err != nil {
+		log.Fatal(err)
+	}
+}
+
 func main() {
 	fmt.Println("Hello, world")
 }