import time
import vk_api

vk = vk_api.VkApi(token = 'твой_ключ')

param = {
    'count': 1,
    'time_offset': 5,
    'filter': 'unread'
}


def write_msg(user_id, msg, random): 
    vk.method('messages.send', { 
        'user_id': user_id, 
        'message': msg,
        'random_id': random
    }) 


try:
    while True: 
        response = vk.method('messages.getConversations', param) 
        if response['items']: 
            item = response['items'][0] 
            last_mess = item['last_message'] 
            random = last_mess['random_id'] 
            my_id = last_mess['peer_id'] 
            text = last_mess['text'] 
            write_msg(my_id, text, random) 
        time.sleep(1) 
except KeyboardInterrupt:
    print('Keyboard interrupt detected.')
finally:
    print('The program was stopped.')