There is one small mistake in Michael's answer. Variable 'r' should not
be put behind but ahead. So operator '+=' could not be used here. You can use
the following statement instead.
b = r + ',' + b
Operator '+' concatenate string together to make a new string. In this
statement it concatenate three strings together, 'r' and 'b' are str type
varible, ',' is str type value.
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