Question: how many characters are present in icd-10 codes
[{'answer': '7'}, {'provenance': [{'wikipedia_id': '13745451', 'title': 'ICD-10', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9245986219276785269}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '26470902', 'title': 'ICD-10 Clinical Modification', 'section': 'Section::::Conventions.:Level of detail in coding.\n', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 54, 'bleu_score': 1.0}]}]