diff --git a/04dec/input b/04dec/input
new file mode 100644
index 0000000..0517140
--- /dev/null
+++ b/04dec/input
@@ -0,0 +1,512 @@
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diff --git a/04dec/main.go b/04dec/main.go
new file mode 100644
index 0000000..03f4181
--- /dev/null
+++ b/04dec/main.go
@@ -0,0 +1,39 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+)
+
+var in string
+
+func main() {
+	fmt.Scanf("%s", &in)
+	sum := 0
+	in := bufio.NewScanner(os.Stdin)
+	for in.Scan() {
+		if checkPassphrase(in.Text()) {
+			sum++
+		}
+	}
+	fmt.Println(sum)
+}
+
+func checkPassphrase(d string) bool {
+	//fmt.Println(d)
+	words := strings.Split(d, " ")
+	for i, e := range words {
+		if i > 0 {
+			//fmt.Println(i, e)
+			for _, f := range words[0:i] {
+				//fmt.Println(e, f)
+				if f == e {
+					return false
+				}
+			}
+		}
+	}
+	return true
+}