Question I got 6 errors and I don't find them can somebody help me?

I attached my script. I already searched for two hours but I dont find the problem. I didn't even write any script but the error happens anyways. I think I just type the errors right here:
~/3rdPersonCam.cs(5,14): error CS1001: Identifier expected
~/3rdPersonCam.cs(5,14): error CS1514: { expected
~/3rdPersonCam.cs(5,14): error CS1513: } expected
~/3rdPersonCam.cs(5,14): error CS8803: Top-leven statements must precede namespace and type declarations
~/3rdPersonCam.cs(5,15): error CS1002: ; expected
~/3rdPersonCam.cs(5,42): error CS1002: ; expected
Thank you if you would respond! If you can't see my script somehow here it is as text:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class 3rdPersonCam : MonoBehaviour
{
// Start is called before the first frame update
void Start()
{

}

// Update is called once per frame
void Update()
{

}
}

 

You can't start a script name with a number

 

Oh, thank you!