Returns True if s is a valid numerical string; it returns False otherwise.
A valid numerical string is one with only digits and commas, and commas only
appear at every three digits. In addition, a valid string only starts with
a 0 if it has exactly one character.
Pay close attention to the precondition, as it will help you (e.g. only numbers
< 1,000,000 are possible with that string length).
valid_format('12') returns True
valid_format('apple') returns False
valid_format('1,000') returns True
valid_format('1000') returns False
valid_format('10,00') returns False
valid_format('0') returns True
valid_format('012') returns False
Parameter s: the string to check
Precondition: s is nonempty string with no more than 7 characters
if text <=3 and introcs.isnumeric(s):
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