diff --git a/main.go b/main.go
index 6a7f115..ec4a30b 100644
--- a/main.go
+++ b/main.go
@@ -16,10 +16,7 @@ func init() {
 }
 
 func main() {
-	//psyfer.ReadConfig()
-	//psyfer.Substitution("hello")
-	var input string
-	//var key string
+	var key string
 	var decrypt bool
 
 	var trans = &cobra.Command{
@@ -32,11 +29,18 @@ func main() {
 	}
 
 	var sub = &cobra.Command{
-		Use:   "sub mode -c [cipher] -k [key] -i [input]",
+		Use:   "sub",
 		Short: "substitution cipher",
 		Long:  `perform substitution cipher`,
 		Run: func(cmd *cobra.Command, args []string) {
-			fmt.Println("missing input, see -h (--help) for more info")
+			if key == "" || len(args) < 1 {
+				fmt.Println("missing input, see -h (--help) for more info")
+				os.Exit(1)
+			}
+			psyfer.ReadConfig(key)
+			for _, arg := range args {
+				fmt.Println(psyfer.Substitution(arg))
+			}
 		},
 	}
 
@@ -135,16 +139,15 @@ func main() {
 	)
 
 	sub.Flags().StringVarP(
-		&input,
-		"input",
-		"i",
+		&key,
+		"key",
+		"k",
 		"",
-		"string to be encrypted",
+		"file containing key",
 	)
 
 	var rootCmd = &cobra.Command{Use: "app"}
 	rootCmd.AddCommand(sub, aes, trans, vig)
-	sub.AddCommand(crack)
 	aes.AddCommand(crack)
 	trans.AddCommand(random, railfence, split)
 	vig.AddCommand(crack)
diff --git a/psyfer/substitution.go b/psyfer/substitution.go
index ac10d49..cb8b4f9 100644
--- a/psyfer/substitution.go
+++ b/psyfer/substitution.go
@@ -2,7 +2,6 @@ package psyfer
 
 import (
 	"encoding/json"
-	"fmt"
 	"io/ioutil"
 	"log"
 )
@@ -13,13 +12,13 @@ type KeyJSON struct {
 
 var k = KeyJSON{}
 
-func ReadConfig() {
-	dat, err := ioutil.ReadFile("key.json")
+func ReadConfig(file string) {
+	dat, err := ioutil.ReadFile(file)
 	if err != nil {
 		log.Fatal(err)
 	}
 	json.Unmarshal([]byte(dat), &k)
-	fmt.Println(k.Key["a"])
+	k.Key[" "] = " " // keep spaces alive
 }
 
 func Substitution(input string) string {
@@ -31,6 +30,5 @@ func Substitution(input string) string {
 	for i := range inputSlice {
 		output += k.Key[inputSlice[i]]
 	}
-	fmt.Println(output)
 	return output
 }