Disable Diagonal Movement

Hi, I'm very new to unity and C# programming. I have made a game (beginning) by following a tutorial on youtube and he didn't disabled the diagonal movements because he wanted them but I don't. So I have no idea how to do that.

  public class PlayerControllerv2 : MonoBehaviour
 {
     private Rigidbody2D myRB;
 
     [SerializeField]
     private float speed;
     
     void Start()
     {
         myRB = GetComponent<Rigidbody2D>();
         
     }
     // Update is called once per frame
     void Update()
     {
         myRB.velocity = new Vector2(Input.GetAxisRaw("Horizontal")*speed*Time.deltaTime,Input.GetAxisRaw("Vertical") * speed * Time.deltaTime);
     }
 }