Convert from stride [great] to attometer

Unit Definition (stride [great])
Distance between consecutive prints of the same foot in a track, measured from the same point on each foot.

Unit Definition (attometer)
An Attometer (or attometre) is equal to one quintillionth of a meter, or sometimes denoted as 10e-18 meters. The origin of the prefix is atten, the word for 18 in Danish and Norwegian.