forward --Command, one input. Abbreviation: fd
     The input is a number, the distance you would like the turtle to move.
     For a floor turtle, the unit of distance is however far the turtle can
     travel in 1/30 second. For a display turtle, the unit is one dot on
     the TV screen. (Note: on some displays, one dot horizontally may not
     be the same length as one dot vertically. The setscrunch command
     allows you to control the relative sizes so that squares come out
     square.) The turtle moves in whatever direction it is pointing when
     you use the command.