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C# first three letters from every string

using System;
using System.Linq;
using System.Collections.Generic;

class Demo {
   static void Main() {
      List<object> list = new List<object> { "keyboard", "mouse", "joystick", "monitor" };

      // getting first 3 letters from every string
      IEnumerable<string> res =  list.AsQueryable() .Cast<string>() .Select(str => str.Substring(0,3));
      foreach (string str in res){
         Console.WriteLine(str);
      }
   }
}

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