Update app.py

app.py

@@ -38,8 +38,8 @@ def split_text_to_rows(text, n):
 
 def split_text_to_rows_by_chars(text, n):
     list_of_rows = []
-    for i in range(0, len(a), n):
-        list_of_rows.append(a[i:n+i].strip())
+    for i in range(0, len(text), n):
+        list_of_rows.append(text[i:n+i].strip())
     return list_of_rows