diff --git a/main_form.cs b/main_form.cs
index 2c11182..75e626a 100644
--- a/main_form.cs
+++ b/main_form.cs
@@ -100,13 +100,16 @@ namespace KRY_0x01_ng
             TextBox tb_pruned_k = textBox2;
             TextBox tb_nualph = textBox3;
             tb_pruned_k.Text = str_to_check;
-            nualphabet = alphabet.Except(str_to_check.ToArray()).ToArray();
-            string nualph_str = "";
-            for (int i = 0; i < nualphabet.Length; i++)
+            char[] transient_alph = new char[25];
+            transient_alph = alphabet.Except(str_to_check.ToArray()).ToArray();
+            string transientalph_str = "";
+            for (int i = 0; i < transient_alph.Length; i++)
             {
-                nualph_str += nualphabet[i];
+                transientalph_str += transient_alph[i];
             }
-            tb_nualph.Text = str_to_check + nualph_str;
+            string nualph_str = str_to_check + transientalph_str;
+            tb_nualph.Text = nualph_str;
+            nualphabet = nualph_str.ToCharArray();
             return;
         }