Oops, I missed the task! )
And the main thing is that I knew the answer to this question for sure.
I will also add, when you delete a message, for example, from viber, then a mark remains that something has been deleted. There is not even such a mark in telegram. Not a trace remains. I may be wrong, but earlier it was still possible to remove yourself from the contacts of another person. Now I don't see this function.