Help with python3 (BeautifulSoup)

[freaknez]

import requests
from termcolor import *
import colorama
from bs4 import BeautifulSoup
colorama.init()
headers = {
	"Cookie": "PHPSESSID=Testing",
	"User-Agent": "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.81 Safari/537.36"
}

url = "http://naruto.lt/kovos.php?kur=mob&kas=kzm_Futa%20Kagetsu"
r = requests.get(url, headers=headers)
soup = BeautifulSoup(r.content, 'html.parser')

r.content shows link (http://naruto.lt/kovos.php?kur=begin&ref=[GENERATING RANDOM NUMBERS]&kas=kzm_Futa%20Kagetsu) how i can get $_GET['ref'] ? i tried to do in many ways but nothing worked

sorry for bad english