How can a telegram bot respond to emoticons?

Question

Java

When I wrote one dialog bot, I had a problem with emoji, or rather the bot's response to the emoticons that were sent to it. The bot itself can send emoticons along with the text, but it is not able to respond to them. It is written in java and all libraries are in place.
How can I make the bot recognize emoticons sent to it?

"Bot on the left. (Sorry for the flag of the USSR, accidentally got out)"

Answer 1

Catch what comes there, what text, and write the logic of the answer.
Everything seems to be obvious.

Answer 2

Use the emoji4j library to recognize emoji .