diff --git a/src/main/java/com/example/HelloWorld.java b/src/main/java/com/example/HelloWorld.java
index d685e89..9b14781 100644
--- a/src/main/java/com/example/HelloWorld.java
+++ b/src/main/java/com/example/HelloWorld.java
@@ -1,5 +1,6 @@
 package com.example;
 
+import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableSet;
 
 public final class HelloWorld {
@@ -17,6 +18,10 @@ public static ImmutableSet<String> helloWorld() {
     return ImmutableSet.copyOf(set);
   }
 
+  public static ImmutableList<Integer> helloWorldCharacters() {
+    return "Hello World!".chars().boxed().collect(ImmutableList.toImmutableList());
+  }
+
   public static boolean isEmpty(String str) {
     return str.length() == 0;
   }