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c = 0
while True:
	...
    if p < 0: break
    c += 1
    S = S[p+2:]

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
    if p < 0: break
                  ^
IndentationError: unindent does not match any outer indentation level

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: Sorry: IndentationError: unindent does not match any outer indentation level (prog.py, line 4)

Standard output is empty