% ruby space.rb simulate public_1.in 
=== Starports ===
Earth 1
Vulcan 1
=== Starships ===
Enterprise 1
=== Travelers ===
Kirk Earth Vulcan 
=== Output ===
Enterprise docking at Earth
  Kirk boarding Enterprise at Earth
Enterprise departing from Earth
Enterprise docking at Vulcan
  Kirk departing Enterprise at Vulcan
