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# your code goes here
import re
 
print(re.sub(r'\b'{4, }, '-', 'a-b-c-d-e'))

Traceback (most recent call last):
  File "/usr/lib/python3.7/py_compile.py", line 143, in compile
    _optimize=optimize)
  File "<frozen importlib._bootstrap_external>", line 791, in source_to_code
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "./prog.py", line 4
    print(re.sub(r'\b'{4, }, '-', 'a-b-c-d-e'))
                      ^
SyntaxError: invalid syntax

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.7/py_compile.py", line 147, in compile
    raise py_exc
py_compile.PyCompileError:   File "./prog.py", line 4
    print(re.sub(r'\b'{4, }, '-', 'a-b-c-d-e'))
                      ^
SyntaxError: invalid syntax

Standard output is empty