Substitution cipher has to do with the replacement of letters of the alphabet in different iterations so that it would be difficult to understand for anybody who does not know the cipher key.
Based on your given question, there is no cipher key given to help to break the code which was given, so there is very little that can be done on my part unless you seek the help of a professional cryptologist or code breaker.
Please note that your question is incomplete so I gave you a general overview so that you could get a better understanding of the concept.
Read more about substitution cipher here:
https://brainly.com/question/25048487
