diff --git a/1ano/2semestre/poo/src/aula12/ex1/DifferentWordCounter.java b/1ano/2semestre/poo/src/aula12/ex1/DifferentWordCounter.java
new file mode 100644
index 0000000..ed4681e
--- /dev/null
+++ b/1ano/2semestre/poo/src/aula12/ex1/DifferentWordCounter.java
@@ -0,0 +1,22 @@
+package aula12.ex1;
+
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Scanner;
+
+public class DifferentWordCounter {
+    public static void main(String[] args) throws FileNotFoundException {
+        Scanner reader = new Scanner(new FileReader((new Scanner(System.in)).nextLine()));
+        List<String> words = new ArrayList<>();
+
+        while (reader.hasNext()) words.add(reader.next());
+
+        HashSet<String> differentWords = new HashSet<>(words);
+
+        System.out.println("Number of words: " + words.size());
+        System.out.println("Number of different words: " + differentWords.size());
+    }
+}