diff --git "a/src/com/school/faang/hashset/\320\267\320\260\320\264\320\260\321\207\320\260_3/Solution.java" "b/src/com/school/faang/hashset/\320\267\320\260\320\264\320\260\321\207\320\260_3/Solution.java"
index 3b56bed..ad76681 100644
--- "a/src/com/school/faang/hashset/\320\267\320\260\320\264\320\260\321\207\320\260_3/Solution.java"
+++ "b/src/com/school/faang/hashset/\320\267\320\260\320\264\320\260\321\207\320\260_3/Solution.java"
@@ -1,7 +1,39 @@
 package com.school.faang.hashset.задача_3;
 
+import java.util.HashSet;
+import java.util.Set;
+
 public class Solution {
     public static void main(String[] args) {
+        Set<String> firstUserContacts = Set.of(
+                "Alisa",
+                "David",
+                "Zack",
+                "Mike",
+                "Luck"
+        );
+
+        Set<String> secondUserContacts = Set.of(
+                "Tina",
+                "Toona",
+                "Moona",
+                "Zack",
+                "Luck"
+        );
+
+        Set<String> mutualContacts = MutualContactsFinder.findMutualContacts(firstUserContacts, secondUserContacts);
+
+        System.out.println(mutualContacts.size());
+        System.out.println(mutualContacts);
+    }
+}
+
+class MutualContactsFinder {
+    public static HashSet<String> findMutualContacts(Set<String> contacts1, Set<String> contacts2) {
+        HashSet<String> mutuals = new HashSet<>(contacts1);
+
+        mutuals.retainAll(contacts2);
 
+        return mutuals;
     }
 }