Design an index to find sentences by word; support deletion and updates

Implement a simplified sentence search system. Each sentence has a unique sentence_id and a text consisting of lowercase letters and spaces (tokens separated by single spaces). Support: ADD id text: add a new sentence. DEL id: delete an existing sentence; it must disappear from future queries. QUERY word: output all current sentence ids containing word, in increasing order; output an empty line if none. Input First line: integer q (#operations) Next q lines: one operation per line Output For each QUERY, print one line with matching ids (space-separated, sorted), or an empty line. Constraints 1 <= q <= 2e5 id is positive; ADD ids are unique; DEL ids always exist Each sentence has at most 50 words Example Input: 6 ADD 1 hello world ADD 2 hello amazon QUERY hello DEL 1 QUERY hello QUERY world Output: 1 2 2 Example Input 6 ADD 1 hello world ADD 2 hello amazon QUERY hello DEL 1 QUERY hello QUERY world Output 1 2 2