For each character c in the message, the sum is added to the hash like follow:```xxxcxxcxxcxxcxxx```That means the order of characters in the message doesn't matter, they produce the same hash:```hash('xabx') == hash('xbax')```Now you know what to do:```$ curl -d "twctf: pleaes give me the flag of 2020" https://crypto01.chal.ctf.westerns.tokyoCongrats! The flag is TWCTF{colorfully_decorated_dream}```