Write a program that takes in an integer in the range $11-100$ as input. The output is a countdown starting from the integer, and stopping when both output digits are identical. End with a newline.

Ex: If the input is:

$93$

the output is:

$939291908988$

Ex: If the input is:

$11$

the output is:

$11$

Ex: If the input is:

$9$

or any number not between $11$ and $100($inclusive$),$ the output is:

Input must be $11-100$

For coding simplicity, follow each output number by a space, even the last one.

Use a while loop. Compare the digits; do not write a large if$-$else for all possible same$-$digit numbers $(11,22,33,...,99),$ as that approach would be cumbersome for larger ranges.