Adjusted output texts

numberstation.go

@@ -48,7 +48,7 @@ func main() {
 	defer rl.Close()
 
 	// Inform the user about how to enter input
-	fmt.Println("Enter lines of text (press Enter on a blank line to finish):")
+	fmt.Println("Enter text to be read (A-Z and 0-9 only). Press Enter on a blank line to process:")
 
 	var inputBuilder strings.Builder
 	for {
@@ -82,7 +82,7 @@ func main() {
 			if soundData, ok := soundMap[c]; ok {
 				playSound(soundData)
 			} else {
-				fmt.Printf("No sound file found for character: %c\n", c)
+				fmt.Printf("Invalid character (skipping): %c\n", c)
 			}
 			time.Sleep(pauseBetweenCharacters)
 		}