diff --git a/2018/day_05/main.go b/2018/day_05/main.go
new file mode 100644
index 0000000..78b4e5d
--- /dev/null
+++ b/2018/day_05/main.go
@@ -0,0 +1,56 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"strings"
+)
+
+var alphabet string
+
+func react(s string) string {
+	firstS := s
+	for i := 0; i < len(alphabet); i++ {
+		letter := alphabet[i : i+1]
+		s = strings.Replace(s, letter+strings.ToUpper(letter), "", -1)
+		s = strings.Replace(s, strings.ToUpper(letter)+letter, "", -1)
+	}
+	if firstS == s {
+		return s
+	} else {
+		return react(s)
+	}
+
+}
+
+func main() {
+	var input string
+	alphabet = "abcdefghijklmnopqrstuvwxyz"
+
+	file, err := os.Open("./input")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer file.Close()
+
+	scan := bufio.NewScanner(file)
+	for scan.Scan() {
+		input = scan.Text()
+	}
+	fmt.Printf("Part One: %v\n", len(react(input)))
+
+	min := len(input)
+	for i := 0; i < len(alphabet); i++ {
+		letter := alphabet[i : i+1]
+		try := input
+		try = strings.Replace(try, letter, "", -1)
+		try = strings.Replace(try, strings.ToUpper(letter), "", -1)
+		size := len(react(try))
+		if size < min {
+			min = size
+		}
+	}
+	fmt.Printf("Part Two: %v\n", min)
+}