pos = 12, str = '21098'
pos = 37, str = '45678'
pos = 35, str = '67890'
pos = 13, str = '432109'
pos = 41, str = '89012'
pos = 48, str = '78901'
pos = 52, str = '54321'
pos = 52, str = '54321'
pos = 43, str = '67890'
pos = 24, str = '98765'
pos = 47, str = '78901'
pos = 19, str = '09876'
pos = 34, str = '56789'
pos = 25, str = '78901'
pos = 53, str = '43210'
pos = 23, str = '43210'
pos = 34, str = '78901'
pos = 14, str = '876543'
pos = 15, str = '567890'
pos =  0, str = '23456'