Cryptanalysis

GÓŻSGYT

The ciphertext above contains non-english letters. However, the description says that the text is in english. Is there something wrong?

When I view the code, I do not see any non English letters. Perhaps it is your computer rendering the non-English letters?

Everything NOT in the uppercase alphabet (A-Z) ist just left untouched as it ist and not encrypted...

I have been stuck for a long time in this challange, can some one give a tip on were to start? I tried to search for the key list of the date, use de FLAG as a part of the plug and many other things, used the program Enigma M3 crack and I cant get the awnser.