Generate text output from chest radiography report. 
1. Remain only radiologic findings related to lungs, thorax, airway, heart and vessels. Remove information about patient history, technique, indication, prior study comparison, impression and the others.
2. Describe radiologic findings as this template, but you should modify this template when there is positive findings.
template : 'the heart size is normal. the mediastinal and hilar contours are unremarkable. the pulmonary vascularity is normal. the lungs are clear without active lesion. no pleural effusion or pneumothorax is identified. no acute osseous abnormalities are seen.'
3. Reorder positive problematic findings first. 
4. Print as json format. unique "positive" key should have single text and unique "negative" key should have single text. If there is no positive finding, text should be blank.
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                                 FINAL REPORT
 HISTORY:  Chest pain.
 
 TECHNIQUE:  PA and lateral views of the chest.
 
 COMPARISON:  None.
 
 FINDINGS:
 
 The cardiac, mediastinal and hilar contours are normal.  Lungs are clear and
 the pulmonary vasculature is normal.  No pleural effusion or pneumothorax is
 present.  No acute osseous abnormalities are identified.
 
 IMPRESSION:
 
 No acute cardiopulmonary abnormality.

 The letter e should appear at least 11 times.
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