How do i change animation when shift is pressed / player is running?

So i have this code atm

local InputService = game:GetService("UserInputService")

local Players = game:GetService("Players")

local walkspeed = 16
local RunningSpeed = 32


local player = Players.LocalPlayer
local function Sprint(input, gameProcessed)
    if not gameProcessed then
        if input.UserInputType == Enum.UserInputType.Keyboard then
            local keycode = input.KeyCode
            if keycode == Enum.KeyCode.LeftShift then
                player.Character.Humanoid.WalkSpeed = RunningSpeed 
                player.Character.Animate.run.RunAnim.AnimationId = "rbxassetid://658830056"
            end
        end
    end
end
local function StopSprint(input, gameProcessed)
    if not gameProcessed then
        if input.UserInputType == Enum.UserInputType.Keyboard then
            local keycode = input.KeyCode
            if keycode == Enum.KeyCode.LeftShift then
                player.Character.Humanoid.WalkSpeed = walkspeed
                player.Character.Animate.run.RunAnim.AnimationId = "rbxassetid://2510238627"
            end
        end
    end
end



InputService.InputBegan:Connect(Sprint)
InputService.InputEnded:Connect(StopSprint)

Now i want the run animation to be the ninja running when sprinting and then go back to rthro running. Now this code doesnt work? Any help <3