Oh, an Alphametic. I see what it is but I still do not understand how to actually solve them.
You also might like to pay attention to all the conditions given in the question, we have made a number of assumptions about what are usual side conditions.
Deduction and logic and a small quantity of trial and error (if you discount my putting this into my Alphametic solver - which on this occasion I did not do as I had forgotten that I had written one)