import socket

def main():
    HOST = '127.0.0.1'
    PORT = 10001
    
    with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as s:
        s.bind((HOST, PORT))
        print(f"UDP сервер запущен на {HOST}:{PORT}")
        
        while True:
            data, addr = s.recvfrom(1024)
            message = data.decode('utf-8').strip()
            print(f"От {addr}: {message}")
            
            if message.lower() == 'exit':
                break
            
            response = f"UDP: {message.upper()}"
            s.sendto(response.encode('utf-8'), addr)

if __name__ == '__main__':
    main()