Russian Peasant Multiplication

Implement the Russian Peasant Multiplication

Print every integer as $6$ digits. I.e$.$:

printf$("\%6$d $\%6$d

$",$ n$,$m$)$;

printf$("\%6$d $\%6$d $\%6$d

$",$ n$,$m$,$m$)$;

The last lines should be $20$ chars. I.e$.$:

printf$("\%20$s

$","------")$;

printf$("\%20$d

$",$ sum$)$;

The two numbers to be multiplied togetehr should be command line arguements.

For example:

$./$w$125065$

$5065$

$25130130$

$12260$

$6520$

$310401040$

$120802080$

$------$

$3250$