Old Russian measure of length
The program should make the conversion of the old Russian measures of length in the metric and vice versa.
You are encouraged to solve this task according to the task description, using any language you may know.
Is an example of the transformation of several variables that are linearly. The program accepts a single value in the selected unit, and return it in the rest: vershoks, arshins, sazhens, versts, meters, centimeters and kilometers.