Direction = ""
X = 0
Y = 0

function TurnLeft()
    turtle.turnLeft()
    if(Direction == "X") then Direction = "-Y" end
    if(Direction == "-X") then Direction = "Y" end
    if(Direction == "Y") then Direction = "X" end
    if(Direction == "-Y") then Direction = "-X" end
end

function TurnRight()
    turtle.turnRight()
    if(Direction == "X") then Direction = "Y" end
    if(Direction == "-X") then Direction = "-Y" end
    if(Direction == "Y") then Direction = "-X" end
    if(Direction == "-Y") then Direction = "X" end
end

function TurnBack()
    turtle.turnLeft()
    turtle.turnLeft()
    if(Direction == "X") then Direction = "-X" end
    if(Direction == "-X") then Direction = "X" end
    if(Direction == "Y") then Direction = "-Y" end
    if(Direction == "-Y") then Direction = "Y" end
end

function Forward()
    turtle.forward()
    if(Direction == "X") then X = X + 1 end
    if(Direction == "-X") then X = X - 1 end
    if(Direction == "Y") then Y = Y + 1 end
    if(Direction == "-Y") then Y = Y - 1 end
end