diff --git a/algorithms_task_6/student/include/impl.h b/algorithms_task_6/student/include/impl.h
index 104a3cec..a81655a8 100644
--- a/algorithms_task_6/student/include/impl.h
+++ b/algorithms_task_6/student/include/impl.h
@@ -1,6 +1,16 @@
 #pragma once
 #include <algorithm>
+#include <list>
 
+template <typename Container>
+void stable_sort(Container& target) {
+    std::stable_sort(target.begin(), target.end());
+}
+
+template<typename T>
+void stable_sort(std::list<T>& target) {
+    target.sort();
+}
 
 /**
  * @todo insert_to_sorted
@@ -18,4 +28,7 @@ void insert_to_sorted(Sequence& target, const FwIt sourceBegin, const FwIt sourc
     static_assert(std::is_const<typename std::remove_reference<
                           typename std::iterator_traits<FwIt>::reference>::type>::value,
                       "FwIt must point to const data");
+
+    std::copy(sourceBegin, sourceEnd, std::back_inserter(target));
+    stable_sort(target);
 }