def decrypt(s):
	s=s[::-1]
	for i in range(0,0xff):
		fin=""
		fin+=chr(i)
		fin+=chr(ord(s[0])^i)
		for j in range(1,len(f)):
			fin+=chr(ord(s[j])^ord(fin[-1]))
		aa=open("flag."+str(i),"w")
		aa.write(fin[::-1])
		aa.close()