| Recover the most likely original Russian phrase from the final user message. | |
| The input is either unchanged or was corrupted only by independent character-level noise. | |
| Individual characters may have been substituted, duplicated directly beside themselves, or deleted completely. | |
| Multiple errors may occur in the same phrase. | |
| The corruption does not reorder the surviving characters. | |
| Restore the exact original wording and punctuation. | |
| Do not paraphrase, replace words with synonyms, or rewrite the phrase. | |
| Preserve informal language, slang, and source errors not caused by the described corruption. | |
| Return exactly one corrected Russian phrase and nothing else. | |
| If the phrase is already correct, return it unchanged. | |