How to change the walking animation related to the direction?

Ill make it simple: I want to make the character play a certain walking animation when going forward and another when going backwards, this is what i've tried so far:

local Player = game:GetService("Players").LocalPlayer
local Character = Player.Character
local Humanoid = Character.Humanoid
local Camera = workspace.CurrentCamera
local Result = Camera.CFrame:VectorToObjectSpace(Humanoid.MoveDirection)
while true do
wait(1)
print(Result) --This prints 0,0,0 every 1 second- Doesnt work.
end

Anything that helps me reach my goal would be appreciated, thanks.

I would change the defaut walk animation everytime you press S (or your custom key).

local UIS = game:GetService("UserInputService")
local animateScript = character:WaitForChild("Animate")

-- Change the defaut walk animation:
animateScript.walk.WalkAnim.AnimationId = "rbxassetid://CustomAnimationForwards"

-- Walk Backwards animation when pressing S:
UIS.InputBegan:Connect(function(key) 
	if key.KeyCode == Enum.KeyCode.S then
		animateScript.walk.WalkAnim.AnimationId = "rbxassetid://CustomAnimationBackWards"
		end
	end
end)

-- Reset Forward animation when release S:
UIS.InputEnded:Connect(function(key) 
	if key.KeyCode == Enum.KeyCode.S then
		animateScript.walk.WalkAnim.AnimationId = "rbxassetid://CustomAnimationForWards"
		end
	end
end)

• all defaut animations listed in: https://developer.roblox.com/en-us/articles/using-animations-in-games