Oh my god.My computer is break.When I writing something,the home and the end always is working.But I also write too quakily,
even I don't see the screen.OK,when I finish a work ,can you tell me the work become in end?
We modified the sample output, please check it.

This have some cases.
Every case have a sentence(length< 200000 Include (A->Z a->z 0->9)).Then '[' is the home,']' is the end;

Input a sentence.

Printf the finally sentence.