diff --git a/sem2/ZolotovskiiED/homework_3/input.txt b/sem2/ZolotovskiiED/homework_3/input.txt
new file mode 100644
index 00000000..3c03a9ca
--- /dev/null
+++ b/sem2/ZolotovskiiED/homework_3/input.txt
@@ -0,0 +1,6 @@
+Hello world
+C++ programming is fun
+Lambda expressions
+STL algorithms
+Short
+A very long string just for testing purposes
diff --git a/sem2/ZolotovskiiED/homework_3/main.cpp b/sem2/ZolotovskiiED/homework_3/main.cpp
new file mode 100644
index 00000000..cd7ddb7d
--- /dev/null
+++ b/sem2/ZolotovskiiED/homework_3/main.cpp
@@ -0,0 +1,114 @@
+#include <algorithm>
+#include <cstddef>
+#include <fstream>
+#include <iostream>
+#include <iterator>
+#include <string>
+#include <vector>
+
+int main() {
+  std::ifstream file_input("input.txt");
+  std::ofstream file_output("output.txt");
+
+  std::vector<std::string> start_lines;
+  std::string line;
+
+  std::size_t max_len_line = 0;
+  std::string search_word;
+
+  std::cin >> max_len_line;
+  std::cin >> search_word;
+
+  while (std::getline(file_input, line)) {
+    start_lines.push_back(line);
+  }
+
+  file_output << "Исходный вектор:\n";
+
+  std::for_each(start_lines.begin(), start_lines.end(),
+                [&file_output](const std::string& current_line) {
+                  file_output << current_line << "\n";
+                });
+
+  std::vector<std::string> short_lines = start_lines;
+
+  short_lines.erase(
+      std::remove_if(short_lines.begin(), short_lines.end(),
+                     [max_len_line](const std::string& current_line) {
+                       return current_line.length() < max_len_line;
+                     }),
+      short_lines.end());
+
+  file_output << "\nВектор после удаления коротких строк:\n";
+
+  std::for_each(short_lines.begin(), short_lines.end(),
+                [&file_output](const std::string& current_line) {
+                  file_output << current_line << "\n";
+                });
+
+  std::vector<std::string> space_lines = short_lines;
+
+  std::for_each(space_lines.begin(), space_lines.end(), [](std::string& current_line) {
+    std::replace(current_line.begin(), current_line.end(), ' ', '_');
+  });
+
+  file_output << "\nВектор после замены пробелов на '_':\n";
+
+  std::for_each(space_lines.begin(), space_lines.end(),
+                [&file_output](const std::string& current_line) {
+                  file_output << current_line << "\n";
+                });
+
+  std::vector<std::string> found_lines;
+
+  std::copy_if(space_lines.begin(), space_lines.end(), std::back_inserter(found_lines),
+               [&search_word](const std::string& current_line) {
+                 return current_line.find(search_word) != std::string::npos;
+               });
+
+  file_output << "\nРезультат поиска заданного слова:\n";
+
+  if (!found_lines.empty()) {
+    std::for_each(found_lines.begin(), found_lines.end(),
+                  [&file_output](const std::string& current_line) {
+                    file_output << current_line << "\n";
+                  });
+  } else {
+    file_output << "Строки с заданным словом не найдены\n";
+  }
+
+  std::vector<std::string> count_lines = space_lines;
+
+  std::for_each(count_lines.begin(), count_lines.end(), [](std::string& current_line) {
+    current_line.erase(std::remove(current_line.begin(), current_line.end(), '_'),
+                       current_line.end());
+  });
+
+  int count_symbols = 0;
+
+  std::for_each(count_lines.begin(), count_lines.end(),
+                [&count_symbols](const std::string& current_line) {
+                  count_symbols += current_line.length();
+                });
+
+  file_output << "\nОбщее количество символов без '_':\n";
+  file_output << count_symbols << "\n";
+
+  std::vector<int> len_lines;
+
+  std::transform(space_lines.begin(), space_lines.end(), std::back_inserter(len_lines),
+                 [](const std::string& current_line) {
+                   return current_line.length();
+                 });
+
+  file_output << "\nВектор длин строк:\n";
+
+  std::for_each(len_lines.begin(), len_lines.end(), [&file_output](int current_len) {
+    file_output << current_len << " ";
+  });
+
+  file_input.close();
+  file_output.close();
+
+  return 0;
+}
diff --git a/sem2/ZolotovskiiED/homework_3/output.txt b/sem2/ZolotovskiiED/homework_3/output.txt
new file mode 100644
index 00000000..197675b8
--- /dev/null
+++ b/sem2/ZolotovskiiED/homework_3/output.txt
@@ -0,0 +1,30 @@
+Исходный вектор:
+Hello world
+C++ programming is fun
+Lambda expressions
+STL algorithms
+Short
+A very long string just for testing purposes
+
+Вектор после удаления коротких строк:
+Hello world
+C++ programming is fun
+Lambda expressions
+STL algorithms
+A very long string just for testing purposes
+
+Вектор после замены пробелов на '_':
+Hello_world
+C++_programming_is_fun
+Lambda_expressions
+STL_algorithms
+A_very_long_string_just_for_testing_purposes
+
+Результат поиска заданного слова:
+C++_programming_is_fun
+
+Общее количество символов без '_':
+96
+
+Вектор длин строк:
+11 22 18 14 44 
\ No newline at end of file