(full writeup at the link)
write a script to bruteforce:
```pythonli = dict(zip("ABCDEFGHIJKLMNOPQRSTUVWXYZ",range(26))) # letter -> integeril = dict(zip(range(26),"ABCDEFGHIJKLMNOPQRSTUVWXYZ")) # integer -> letter
cipher = "CGULKVIPFRGDOOCSJTRRVMORCQDZG"
for i in range(1, 26):    sub = 0 # counter for what to subtract by    m = "" # message    for l in cipher:        nc = (li[l] + (i - sub)) % 26 # get integer representation of new letter        m += il[nc] # add letter to message        sub -= 1 # reduce the subtraction counter by 1    print(m)```
Only reasonable answer in response is "GLASSESAREUSEFULDONOTLOSETHEM"flag is: hsctf{GLASSESAREUSEFULDONOTLOSETHEM}