plr.CharacterAdded:Connect(function(ctr) not functioning?

plr = game.Players.LocalPlayer
UIS = game:GetService("UserInputService")
punch = false
damage = false
dmg = plr:WaitForChild("Stats"):WaitForChild("Strength")
health = dmg.Value
plr.CharacterAdded:Connect(function(ctr)
	local leftpunch = Instance.new("Animation")
	leftpunch.AnimationId = "rbxassetid://2523553984"
	leftpunchtrack = ctr:WaitForChild("Humanoid"):LoadAnimation(leftpunch)
	local leftkick = Instance.new("Animation")
	leftkick.AnimationId = "rbxassetid://2714423586"
	leftkicktrack = ctr:FindFirstChild("Humanoid"):LoadAnimation(leftkick)
	local rightkick = Instance.new("Animation")
	rightkick.AnimationId = "rbxassetid://2714442073"
	rightkicktrack = ctr:WaitForChild("Humanoid"):LoadAnimation(rightkick)
	local leftkick = Instance.new("Animation")
	leftkick.AnimationId = "rbxassetid://2714423586"
	leftkicktrack = ctr:WaitForChild("Humanoid"):LoadAnimation(leftkick)
	rightpunch = Instance.new("Animation")
	rightpunch.AnimationId = "rbxassetid://2714449029"
	rightpunchtrack = ctr:WaitForChild("Humanoid"):LoadAnimation(rightpunch)
	thing = {leftpunchtrack, rightpunchtrack, leftkicktrack, rightkicktrack}
	UIS.InputBegan:Connect(function(key ,process)
		print(process)
		if process == false and key.KeyCode == Enum.KeyCode.E then
			print('clicked e')
			if punch == false then
				print("PUNCH")
				punch = true
				an = thing[math.random(1, #thing)]
				an:Play()
				plr:WaitForChild("Stats"):WaitForChild("Strength").Value = plr.Stats.Strength.Value + 5
				print("played")
				damage = true
				wait(0.5)
				punch = false
			end
		end
	end)
	ctr:WaitForChild("Left Arm").Touched:Connect(function(hit)--i need left arm to be what animation it plays
	attack = hit.Parent:FindFirstChild("Humanoid")
	if attack and damage and punch then
		attack:TakeDamage(health)
	end
	end)
	
end)

dmg.Changed:Connect(function(Value)
	health = Value
end)

When I test sometimes it prints and it does what it's supposed to do. But sometimes it's not even printing anything and not playing animations. Also in this question i want to include that in line 41 i want the ctr:WaitForChild("Left Arm") to be which ever animation it plays meaning if i do right punch it is Right Arm(r6).