User input service is not printing anything, what i do?

Idk what is happening, but it doesnt prints anything. I wanted to use this for playing a animation, but idk what to do... /:

local UIS = game:GetService("UserInputService")

UIS.InputBegan:Connect(function(Input)
    print("a") 
    if Input.KeyCode == Enum.KeyCode.H then
        print("a")
    end
end)

i've made other script too, but it works, and the first one don't.

local player = game.Players.LocalPlayer
local mouse = player:GetMouse()
local UserInputService = game:GetService("UserInputService")
UserInputService.InputBegan:Connect(function(input, gameProcessedEvent)
    if input.KeyCode == Enum.KeyCode.G then
        mouse.Target:Destroy()
        print(mouse.Target)
    end
end)