diff --git a/index.html b/index.html
index b002f52..f211946 100644
--- a/index.html
+++ b/index.html
@@ -241,7 +241,8 @@
                 canvas.height = window.innerHeight;
                 canvas.width = window.innerWidth;
 
-                const letters = '学而时习之不亦说乎教学相长也学而不厌诲人不倦大学之道在明明德在亲民止于至善ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
+                // const letters = '学而时习之不亦说乎教学相长也学而不厌诲人不倦大学之道在明明德在亲民止于至善ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
+                const letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
                 const lettersArray = letters.split('');
 
                 const fontSize = 16;