import socket

def main():
    HOST = '127.0.0.1'
    PORT = 65432
    
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
        s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        s.bind((HOST, PORT))
        s.listen(1)
        print(f"TCP сервер запущен на {HOST}:{PORT}")
        
        conn, addr = s.accept()
        with conn:
            print(f"Подключен клиент: {addr}")
            while True:
                data = conn.recv(1024)
                if not data:
                    break
                
                message = data.decode('utf-8').strip()
                print(f"Получено: {message}")
                
                if message.lower() == 'exit':
                    print("Завершение работы...")
                    break
                
                response = f"SERVER: {message.upper()}"
                conn.sendall(response.encode('utf-8'))

if __name__ == '__main__':
    main()