The sequence of natural numbers from
to
is represented without any spaces between them. The decimal sequence obtained is sorted descending the one-digit numbers corresponding to the decimals. For example for
and
the ordered sequence will have the following representation:
98765211110. For
and
the sequence will contain as many “7” digits as____, the first of which is in position with ordinal number _____.
Give your answer in two numbers separated by a comma. For example for
and
in the sequence there will be 19 digits of 7 beginning from position number 39. Thus the result is written as 19,39