Given a string of digits, output all the contiguous substrings of length n in that string in the order that they appear. For example, the string 49142 has the following 3-digit series:

491, 914, 142

And the following 4-digit series:

4914, 9142

Note that these series are only required to occupy adjacent positions in the input; the digits need not be numerically consecutive. Implement a slices

function that takes two arguments. First, the series to be sliced

as a string, and second, the length of the slices. If the requested length is non-positive or

greater than the length of the provided series, your program should raise a

ValueError .For example, calling slices(9142, 2)

should return [91, 14, 42] and calling slices(777777, 3) should return [777, 777, 777, 777]