diff --git a/src/Go/003.go b/src/Go/003.go
new file mode 100644
index 0000000..fb9b1fa
--- /dev/null
+++ b/src/Go/003.go
@@ -0,0 +1,31 @@
+package main
+
+import (
+	"fmt"
+	"sort"
+)
+
+var ORDER = []string{"R", "A", "M"}
+
+func tricolor_flag(lst []string) []string {
+	result := append([]string(nil), lst...) // copy (like Python sorted)
+	order := make(map[string]int, len(ORDER))
+	for i, v := range ORDER {
+		order[v] = i
+	}
+
+	sort.SliceStable(result, func(i int, j int) bool {
+		return order[result[i]] < order[result[j]]
+	})
+
+	return result
+
+}
+
+func main() {
+	check := []string{"M","R","A","A","R","R","A","M","M"}
+	fmt.Println(tricolor_flag(check)) // [R,R,R,A,A,A,M,M,M]
+
+	check = []string{"M", "R", "A", "R", "R", "A"}
+	fmt.Println(tricolor_flag(check)) // [R,R,R,A,A,M]
+}