Name of question : DUMBONE

DESCRIPTION (as per the Icectf webste):

I joined a couple of hacking channels on IRC and I started recieving these strange messages. Someone sent me this image. Can you figure out if there's anything suspicous hidden in it?
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Write up:

In this CRYPTO question we had been given 2 things in the picture garfeld.png

First the ciphered text : "IjgJUO{P_LOUV_AIRUS_GYQUTOLTD_SKRFB_TWNKCFT}"

and a key on the top right of the photo

KEY="07271978"

In the python file i have given the code.
In the code it is basically moving backward the current alphabet with the respective number given in the key.

Note: It is only for the alphabets not for the symbols

For example :
Ijg will be deciphered as below:

'I' : 'I'-0='I'
'j' : 'j'-7='c'
'g' : 'g'-2='e'

After running the python file the flag appeared :"IceCTF{I_DONT_THINK_GRONSFELD_LIKED_MONDAYS}"

Original writeup (https://github.com/d4rkvaibhav/IceCTF-2018/tree/master/Cryptography).