diff --git a/src/main/scala/HHCSim.scala b/src/main/scala/HHCSim.scala
index 17911c1..3632c9a 100644
--- a/src/main/scala/HHCSim.scala
+++ b/src/main/scala/HHCSim.scala
@@ -11,6 +11,7 @@ class HHCSim(
       customers: Either[String, IndexedSeq[Customer]]
   ): String Either Map[Int, IndexedSeq[(Int, Double)]] =
     customers
+      .flatMap(checkEmpty)
       .map(Util.formAdjMatrix)
       .map(edges => Util.mstUsingPrims(edges))
       .map(mst => Util.findCentroids(mst))
@@ -28,4 +29,13 @@ class HHCSim(
               Util.groupClusters(centroids, clusters, removed)
           }
       )
+
+  def checkEmpty(
+      customers: IndexedSeq[Customer]
+  ): Either[String, IndexedSeq[Customer]] =
+    customers.length match {
+      case 0 => Left("Error input was empty")
+      case _ => Right(customers)
+    }
+
 }
diff --git a/src/main/scala/Main.scala b/src/main/scala/Main.scala
index e24e002..f8f9376 100644
--- a/src/main/scala/Main.scala
+++ b/src/main/scala/Main.scala
@@ -14,16 +14,26 @@ object Main {
 
     val customers = Util.getCustomers(bufferedSource)
     bufferedSource.close()
+
+    val hhc = new HHCSim(epsilonMax = 40, iterations = 10, WLDMax = 10)
+    val fnl2 = hhc.go(customers)
     // customers.map(println(_))
 
     // val edges3 = customers.map(Util.formAdjMatrix)
 
     // val fnl2 = go(customers)
 
-    // fnl2 match {
-    //   case Left(value)  => println(value)
-    //   case Right(value) => println(value)
-    // }
+    fnl2 match {
+      case Left(value) => println(value)
+      case Right(groups) =>
+        groups.foreach(c => {
+          print(s"${c._1} -> ")
+          c._2.foreach(e => {
+            print(f"(${e._1}%d, ${e._2}%.2f), ")
+          })
+          println
+        })
+    }
 
     // edges3 match {
     //   case Right(e) =>