Multiple replacing at the same time

Suppose in my document, I have the words A, B and C. All I want to do is to replace the words A, B, and C to the word D. I think an OR command will solve the problem. I found OR in GREP, but it seems there isn't such a command in Find/Replace section. Meaning that:

Find: A OR B OR C
Replace: D

Of course I'm able to replace them one by one with separate replace commands, but since there are numerous such replacements in my document, I prefer to have a saved replace function.