diff --git a/pkg/innerring/alphabet.go b/pkg/innerring/alphabet.go
index 518c1819..78930db7 100644
--- a/pkg/innerring/alphabet.go
+++ b/pkg/innerring/alphabet.go
@@ -52,96 +52,56 @@ const (
 	lastLetterNum
 )
 
+var glagolicLetterToString = map[GlagoliticLetter]string{
+	az:              "az",
+	buky:            "buky",
+	vedi:            "vedi",
+	glagoli:         "glagoli",
+	dobro:           "dobro",
+	yest:            "yest",
+	zhivete:         "zhivete",
+	dzelo:           "dzelo",
+	zemlja:          "zemlja",
+	izhe:            "izhe",
+	izhei:           "izhei",
+	gerv:            "gerv",
+	kako:            "kako",
+	ljudi:           "ljudi",
+	mislete:         "mislete",
+	nash:            "nash",
+	on:              "on",
+	pokoj:           "pokoj",
+	rtsi:            "rtsi",
+	slovo:           "slovo",
+	tverdo:          "tverdo",
+	uk:              "uk",
+	fert:            "fert",
+	kher:            "kher",
+	oht:             "oht",
+	shta:            "shta",
+	tsi:             "tsi",
+	cherv:           "cherv",
+	sha:             "sha",
+	yer:             "yer",
+	yeri:            "yeri",
+	yerj:            "yerj",
+	yat:             "yat",
+	jo:              "jo",
+	yu:              "yu",
+	smallYus:        "small.yus",
+	smallIotatedYus: "small.iotated.yus",
+	bigYus:          "big.yus",
+	bigIotatedYus:   "big.iotated.yus",
+	fita:            "fita",
+	izhitsa:         "izhitsa",
+}
+
 // String returns l in config-compatible format.
-//
-// nolint: funlen
 func (l GlagoliticLetter) String() string {
-	switch l {
-	default:
-		return "unknown"
-	case az:
-		return "az"
-	case buky:
-		return "buky"
-	case vedi:
-		return "vedi"
-	case glagoli:
-		return "glagoli"
-	case dobro:
-		return "dobro"
-	case yest:
-		return "yest"
-	case zhivete:
-		return "zhivete"
-	case dzelo:
-		return "dzelo"
-	case zemlja:
-		return "zemlja"
-	case izhe:
-		return "izhe"
-	case izhei:
-		return "izhei"
-	case gerv:
-		return "gerv"
-	case kako:
-		return "kako"
-	case ljudi:
-		return "ljudi"
-	case mislete:
-		return "mislete"
-	case nash:
-		return "nash"
-	case on:
-		return "on"
-	case pokoj:
-		return "pokoj"
-	case rtsi:
-		return "rtsi"
-	case slovo:
-		return "slovo"
-	case tverdo:
-		return "tverdo"
-	case uk:
-		return "uk"
-	case fert:
-		return "fert"
-	case kher:
-		return "kher"
-	case oht:
-		return "oht"
-	case shta:
-		return "shta"
-	case tsi:
-		return "tsi"
-	case cherv:
-		return "cherv"
-	case sha:
-		return "sha"
-	case yer:
-		return "yer"
-	case yeri:
-		return "yeri"
-	case yerj:
-		return "yerj"
-	case yat:
-		return "yat"
-	case jo:
-		return "jo"
-	case yu:
-		return "yu"
-	case smallYus:
-		return "small.yus"
-	case smallIotatedYus:
-		return "small.iotated.yus"
-	case bigYus:
-		return "big.yus"
-	case bigIotatedYus:
-		return "big.iotated.yus"
-	case fita:
-		return "fita"
-	case izhitsa:
-		return "izhitsa"
+	if str, found := glagolicLetterToString[l]; found {
+		return str
 	}
+	return "unknown"
 }
 
 type alphabetContracts map[GlagoliticLetter]util.Uint160