One meter equals $1000$ millimeters. Read length$\_$mm from input as a float and convert length$\_$mm into length$\_$meters. Ex$.$ If the input is $7000\mathrm{.}00,$ then the output is:

$7.000$

$1.$

$21\%$ your code goes here $...$

$4$ print$($F$\text{'}\{$length$\_$meters:. $3f\}\text{'})$