Only accept certan keys in unity?,Only accept certain keys in unity?

Hello! I have made a key listener in unity, but this listens to every key, but I only want A-Z, and enter. I will share the script, but im not sure how to fix this.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using System;
 
 public class KeyLisener : MonoBehaviour
 {
     private int spamStop = 0;
     private int typed = 0; 
     static KeyCode[] kcode;
     private List<KeyCode> keycod;
     private int num = 1;
     private string word = "among";
     private string keys;
 
     // Start is called before the first frame update
     void Start()
     {
         keycod = new List<KeyCode>();
     }
 
     // Update is called once per frame
     async void Update()
     {
         foreach(KeyCode kcode in Enum.GetValues(typeof(KeyCode)))
         {
             if (Input.GetKey(kcode))
             {
                 if(spamStop == 0)
                 {
                     if(typed == 5)
                     {
                         for(int i = 5; i <= 5; i++)
                         {
                             if (spamStop == 0)
                             {
                                 keycod.Add(kcode);
                             }
                         }
                         keys = keycod[0].ToString() + keycod[1].ToString() + keycod[2].ToString() + keycod[3].ToString() + keycod[4].ToString();
                         if(keys.ToLower() == word)
                         {
                             Debug.Log("win");
                         }
                         else
                         {
                             Debug.Log("Word you typed: " + keys.ToLower() + ", You should've typed: " + word);
                         }
                         typed = 0;
                     }
                     Debug.Log("KeyCode down: " + kcode);
                     keycod.Add(kcode);
                     spamStop++;
                     typed++;
                 }
             }
             else if(spamStop == 1)
             {
                 if(!Input.anyKey)
                 {
                     spamStop = 0;
                 }
             }
 
         }
     }
 }

every key is listened to. I really don't want to hardcode them, so if someone has an answer, it would be greatly appreciated.