diff --git a/sem2/DurovaAV/Homework3/input.txt b/sem2/DurovaAV/Homework3/input.txt
new file mode 100644
index 00000000..3f95ed8e
--- /dev/null
+++ b/sem2/DurovaAV/Homework3/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
\ No newline at end of file
diff --git a/sem2/DurovaAV/Homework3/main.cpp b/sem2/DurovaAV/Homework3/main.cpp
new file mode 100644
index 00000000..98fe4d38
--- /dev/null
+++ b/sem2/DurovaAV/Homework3/main.cpp
@@ -0,0 +1,114 @@
+#include <iostream>
+#include <fstream>
+#include <vector>
+#include <string>
+#include <algorithm>
+#include <cctype>
+
+bool isVowel(char c) {
+    char lower = std::tolower(static_cast<unsigned char>(c));
+    return (lower == 'a' || lower == 'e' || lower == 'i' ||
+        lower == 'o' || lower == 'u' || lower == 'y');
+}
+
+int main() {
+    std::ifstream inFile("input.txt");
+    if (!inFile.is_open()) {
+        std::cerr << "Error: cannot open input.txt" << std::endl;
+        return 1;
+    }
+
+    std::vector<std::string> lines;
+    std::string line;
+
+    while (std::getline(inFile, line)) {
+        lines.push_back(line);
+    }
+    inFile.close();
+
+    int porog;
+    std::cout << "Enter length porog: ";
+    std::cin >> porog;
+
+    //удаление строк короче порога (захват по значению)
+    auto removeShort = [porog](const std::string& s) {
+        return static_cast<int>(s.length()) < porog;
+        };
+    std::vector<std::string> afterRemove = lines;
+    afterRemove.erase(std::remove_if(afterRemove.begin(), afterRemove.end(), removeShort),
+        afterRemove.end());
+
+    //удаление гласных из каждой строки
+    std::vector<std::string> afterProcess = afterRemove;
+    for (auto& str : afterProcess) {
+        str.erase(std::remove_if(str.begin(), str.end(),
+            [](char c) { return isVowel(c); }),
+            str.end());
+    }
+
+    //поиск строки с заданным словом (захват по ссылке)
+    std::string searchWord;
+    std::cout << "Enter word to search: ";
+    std::cin >> searchWord;
+    auto searchLambda = [&searchWord](const std::string& s) {
+        return s.find(searchWord) != std::string::npos;
+        };
+    auto it = std::find_if(afterProcess.begin(), afterProcess.end(), searchLambda);
+    std::string searchResult = (it != afterProcess.end()) ? *it : "Not found";
+
+    //подсчёт общего количества символов
+    int totalChars = 0;
+    for (const auto& str : afterProcess) {
+        for (char c : str) {
+            if (c != '_') {
+                ++totalChars;
+            }
+        }
+    }
+
+    //создание вектора длин строк
+    std::vector<int> lengths;
+    for (const auto& str : afterProcess) {
+        lengths.push_back(static_cast<int>(str.length()));
+    }
+
+    //вывод в output.txt
+    std::ofstream outFile("output.txt");
+    if (!outFile.is_open()) {
+        std::cerr << "Error: cannot create output.txt" << std::endl;
+        return 1;
+    }
+
+    outFile << "*+- Original lines -+*\n";
+    for (const auto& l : lines) {
+        outFile << l << "\n";
+    }
+
+    outFile << "\n*+- After removing short lines (porog = " << porog << ") -+*\n";
+    for (const auto& l : afterRemove) {
+        outFile << l << "\n";
+    }
+
+    outFile << "\n*+- After removing vowels -+*\n";
+    for (const auto& l : afterProcess) {
+        outFile << l << "\n";
+    }
+
+    outFile << "\n*+- Search result for \"" << searchWord << "\" -+*\n";
+    outFile << searchResult << "\n";
+
+    outFile << "\n*+- Total characters (excluding '_') -+*\n";
+    outFile << totalChars << "\n";
+
+    outFile << "\n*+- Lengths of strings -+*\n";
+    for (int len : lengths) {
+        outFile << len << " ";
+    }
+    outFile << "\n";
+
+    outFile.close();
+
+    std::cout << "\nProcessing completed! Check output.txt" << std::endl;
+
+    return 0;
+}
\ No newline at end of file
diff --git a/sem2/DurovaAV/Homework3/output.txt b/sem2/DurovaAV/Homework3/output.txt
new file mode 100644
index 00000000..8646ba2d
--- /dev/null
+++ b/sem2/DurovaAV/Homework3/output.txt
@@ -0,0 +1,32 @@
+*+- Original lines -+*
+Hello world
+C++ programming is fun
+Lambda expressions
+STL algorithms
+Short
+A very long string just for testing purposes
+
+*+- After removing short lines (porog = 5) -+*
+Hello world
+C++ programming is fun
+Lambda expressions
+STL algorithms
+Short
+A very long string just for testing purposes
+
+*+- After removing vowels -+*
+Hll wrld
+C++ prgrmmng s fn
+Lmbd xprssns
+STL lgrthms
+Shrt
+ vr lng strng jst fr tstng prpss
+
+*+- Search result for "fn" -+*
+C++ prgrmmng s fn
+
+*+- Total characters (excluding '_') -+*
+84
+
+*+- Lengths of strings -+*
+8 17 12 11 4 32