KEY = 'musZTXmxV58UdwiKt8Tp'

def xor_str(x, y):
    if len(x) > len(y):
        return ''.join([chr(ord(z) ^ ord(p)) for (z, p) in zip(x[:len(y)], y)])
    else:
        return ''.join([chr(ord(z) ^ ord(p)) for (z, p) in zip(x, y[:len(x)])])

key = KEY.encode('hex')
cipher = open('flag.enc','r').read()
dec = xor_str(key*632,cipher)
file = open('flag.png' ,'w')
file.write(dec.decode('hex'))
file.close()