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#!python
import re
def task2(str):
p = re.compile('^[^b]*b[^a]*$')
return bool(p.match(str))
import unittest
class TestTask1(unittest.TestCase):
def t(self, str, expected):
self.assertEqual(task2(str), expected, f"task2('{str}')")
def test_1(self): self.t('aabb' , True )
def test_2(self): self.t('abab' , False)
def test_3(self): self.t('aaa' , False)
def test_4(self): self.t('bbb' , True )
unittest.main()
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