preprogram

#!/usr/bin/python3
import requests, re

pattern = re.compile("<span id='flag'>(.*?)<\/span",re.IGNORECASE)
v=133
flag = ''
for i in range(881):
	url='https://128.199.88.182/calculate.php?step'+str(i)+'='+str(v)
	v = v + 2
	r = requests.get(url,verify=False)
	data = r.text
	match = re.findall(pattern,data)
	if match:
		flag += match[0]
print(flag)