fill two individual portions of an image at a time with values obtained from 'getline' command

I've implemented getline command to obtain the values [for one foot at a time] of the border of feet from an image. With these values, I've filled [using command- fill(columns,rows,'w')] the feet portion of the image. But I'm able to fill only one foot at a time[I've used hold on command]. Is there any possibility to fill [WITH WHITE PIXELS] the feet at a time? [example like the image and output attached here]

Thanks in advance

Good Day