diff --git a/Client App/Client App.csproj b/Client App/Client App.csproj
new file mode 100644
index 0000000..e3ce20d
--- /dev/null
+++ b/Client App/Client App.csproj	
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>Client_App</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>
diff --git a/Client App/Program.cs b/Client App/Program.cs
new file mode 100644
index 0000000..a2db0b6
--- /dev/null
+++ b/Client App/Program.cs	
@@ -0,0 +1,36 @@
+using System;
+using System.Net.Sockets;
+using System.Text;
+
+class Client
+{
+    static void Main()
+    {
+        TcpClient client = new TcpClient();
+
+        try
+        {
+            client.Connect("127.0.0.1", 8888);
+            NetworkStream stream = client.GetStream();
+
+            Console.Write("Текст: ");
+            string text = Console.ReadLine();
+
+            byte[] data = Encoding.UTF8.GetBytes(text);
+            stream.Write(data, 0, data.Length);
+
+            data = new byte[1024];
+            int bytes = stream.Read(data, 0, data.Length);
+            string response = Encoding.UTF8.GetString(data, 0, bytes);
+
+            Console.WriteLine($"Ответ: {response}");
+
+            stream.Close();
+            client.Close();
+        }
+        catch (Exception e)
+        {
+            Console.WriteLine($"Ошибка: {e.Message}");
+        }
+    }
+}
\ No newline at end of file
diff --git a/Client-Server Apps.sln b/Client-Server Apps.sln
index a4d5a8e..5070b14 100644
--- a/Client-Server Apps.sln	
+++ b/Client-Server Apps.sln	
@@ -3,7 +3,25 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 17
 VisualStudioVersion = 17.14.36705.20 d17.14
 MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Client App", "Client App\Client App.csproj", "{82FF86E4-6714-408E-882F-D636C3E658A4}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Server App", "Server App\Server App.csproj", "{A3708F42-6AC7-4828-A5F2-C68B68D6860C}"
+EndProject
 Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{82FF86E4-6714-408E-882F-D636C3E658A4}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{82FF86E4-6714-408E-882F-D636C3E658A4}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{82FF86E4-6714-408E-882F-D636C3E658A4}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{82FF86E4-6714-408E-882F-D636C3E658A4}.Release|Any CPU.Build.0 = Release|Any CPU
+		{A3708F42-6AC7-4828-A5F2-C68B68D6860C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A3708F42-6AC7-4828-A5F2-C68B68D6860C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A3708F42-6AC7-4828-A5F2-C68B68D6860C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A3708F42-6AC7-4828-A5F2-C68B68D6860C}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
 	EndGlobalSection
diff --git a/Server App/Program.cs b/Server App/Program.cs
new file mode 100644
index 0000000..2a81596
--- /dev/null
+++ b/Server App/Program.cs	
@@ -0,0 +1,50 @@
+using System.Net;
+using System.Net.Sockets;
+using System.Text;
+
+class Server
+{
+    static void Main()
+    {
+        TcpListener server = new TcpListener(IPAddress.Any, 8888);
+
+        try
+        {
+            server.Start();
+            Console.WriteLine("Сервер запущен");
+
+            while (true)
+            {
+                TcpClient client = server.AcceptTcpClient();
+                NetworkStream stream = client.GetStream();
+
+                byte[] buffer = new byte[1024];
+                int bytes = stream.Read(buffer, 0, buffer.Length);
+
+                string text = Encoding.UTF8.GetString(buffer, 0, bytes);
+                Console.WriteLine($"Получено: {text}");
+
+                string response = $"OK: {StrProc(text)}";
+                byte[] data = Encoding.UTF8.GetBytes(response);
+                stream.Write(data, 0, data.Length);
+
+                stream.Close();
+                client.Close();
+            }
+        }
+        catch (Exception e)
+        {
+            Console.WriteLine($"Ошибка: {e.Message}");
+        }
+        finally
+        {
+            server.Stop();
+        }
+    }
+
+    //18 вариант
+    private static string StrProc(string str)
+    {
+        return str.Replace('y', 'o');
+    }
+}
\ No newline at end of file
diff --git a/Server App/Server App.csproj b/Server App/Server App.csproj
new file mode 100644
index 0000000..30a4f41
--- /dev/null
+++ b/Server App/Server App.csproj	
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>Server_App</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>