diff --git a/daysix.go b/daysix.go
new file mode 100644
index 0000000..744d793
--- /dev/null
+++ b/daysix.go
@@ -0,0 +1,32 @@
+package main
+
+func areUnique(inputs [4]byte) bool {
+	switch {
+		case inputs[0] == inputs[1]:
+		case inputs[0] == inputs[2]:
+		case inputs[0] == inputs[3]:
+		case inputs[1] == inputs[2]:
+		case inputs[1] == inputs[3]:
+		case inputs[2] == inputs[3]:
+			return false
+	}
+
+	return true
+}
+
+func daySix(input string) (marker int) {
+	var a, b, c, d byte
+	marker = 4
+
+	for i := 3; i < len(input); i++ {
+		a, b, c, d = input[i-3], input[i-2], input[i-1], input[i]
+
+		if areUnique([4]byte{a, b, c, d}) {
+			return
+		}
+
+		marker++
+	}
+
+	return -1
+}
diff --git a/main.go b/main.go
index 72daa8c..a5ff2bf 100644
--- a/main.go
+++ b/main.go
@@ -102,4 +102,12 @@ func main() {
 	for _, r := range dayFiveResult {
 		fmt.Printf("%c ", r)
 	}
+
+
+	/** DAY SIX */
+	fmt.Println("\nDAY SIX")
+	fmt.Println(daySix("bvwbjplbgvbhsrlpgdmjqwftvncz"))
+	fmt.Println(daySix("nppdvjthqldpwncqszvftbrmjlhg"))
+	fmt.Println(daySix("nznrnfrfntjfmvfwmzdfjlvtqnbhcprsg"))
+	fmt.Println(daySix("zcfzfwzzqfrljwzlrfnpqdbhtmscgvjw"))
 }