Revert "Delete lab3 directory"

This reverts commit 6fc3cc244e.

lab3/OperationsStrings/src/Main.java

@@ -0,0 +1,25 @@
+import java.util.HashSet;
+
+public class Main {
+
+    public static void main(String[] args) {
+        String inputText = "Who are you? What is your name? Where are you from?";
+        int targetLength = 3;
+
+        try {
+            HashSet<String> uniqueWords = new HashSet<String>();
+            String[] sentences = inputText.split("[?]");
+            for (String sentence : sentences) {
+                String[] words = sentence.trim().split("\\s+");
+                for (String word : words) {
+                    if (word.length() == targetLength) {
+                        uniqueWords.add(word.toLowerCase());
+                    }
+                }
+            }
+            System.out.println("Unique words of length " + targetLength + " in the input text are: " + uniqueWords);
+        } catch (Exception e) {
+            System.out.println("An error occurred: " + e.getMessage());
+        }
+    }
+}