diff --git a/internal/app/model/dto/challenge_score.go b/internal/app/model/dto/challenge_score.go
index 1cc4673..21110e6 100644
--- a/internal/app/model/dto/challenge_score.go
+++ b/internal/app/model/dto/challenge_score.go
@@ -20,18 +20,26 @@ func (p Scores) Less(i, j int) bool {
 	s3 := strings.ToUpper(p[i].TeamName)
 	s4 := strings.ToUpper(p[j].TeamName)
 
-	temp1 := []byte(p[i].TeamName)
-	temp2 := []byte(p[j].TeamName)
+	temp1 := []rune(p[i].TeamName)
+	temp2 := []rune(p[j].TeamName)
 
-	lcc1 := []byte(s3)
-	lcc2 := []byte(s4)
+	lcc1 := []rune(s3)
+	lcc2 := []rune(s4)
 	for i, _ := range lcc1 {
+		if !isLetterOrNum(lcc1[i]) {
+			lcc1[i] += 300
+		}
+
 		if lcc1[i] >= 48 && lcc1[i] <= 57 {
 			lcc1[i] += 100
 		}
 	}
 
 	for i, _ := range lcc2 {
+		if !isLetterOrNum(lcc2[i]) {
+			lcc2[i] += 300
+		}
+
 		if lcc2[i] >= 48 && lcc2[i] <= 57 {
 			lcc2[i] += 100
 		}
@@ -66,6 +74,13 @@ func (p Scores) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
 
 type Scores []ScoreRank
 
+func isLetterOrNum(b rune) bool {
+	if (b >= 48 && b <= 57) || (b >= 65 && b <= 90) || (b >= 97 && b <= 122) {
+		return true
+	}
+	return false
+}
+
 type ScoreRank struct {
 	Rank          int    `json:"rank"`
 	TeamName      string `json:"team_name"`
diff --git a/internal/app/model/dto/scores_test.go b/internal/app/model/dto/scores_test.go
new file mode 100644
index 0000000..afa1d2e
--- /dev/null
+++ b/internal/app/model/dto/scores_test.go
@@ -0,0 +1,10 @@
+package dto
+
+import (
+	"testing"
+)
+
+func TestScores(t *testing.T) {
+	var scores []string
+	scores = append(scores, "")
+}