diff --git a/src/ArbitraryProject/SecHotspots.cs b/src/ArbitraryProject/SecHotspots.cs
index 0368cfd..e97d1a4 100644
--- a/src/ArbitraryProject/SecHotspots.cs
+++ b/src/ArbitraryProject/SecHotspots.cs
@@ -10,5 +10,10 @@ public bool IsDigit(string input)
         {
             return Regex.IsMatch(input, "\\d");
         }
+
+        public bool IsLetter(string input)
+        {
+            return Regex.IsMatch(input, "[a-zA-Z]");
+        }
     }
 }