Split by Word Casing

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _04.Split_by_Word_Casing
{
    class Program
    {
        static void Main(string[] args)
        {
            List<string> inputText = Console.ReadLine()
                .Split(new char[] { ',', ';', ':', '.', '!', '(', ')',
                '"', '\\', '/', '[', ']', ' ' },
                StringSplitOptions.RemoveEmptyEntries)
                .ToList();
            List<string> lowerCase = new List<string>();
            List<string> upperCase = new List<string>();
            List<string> mixedCase = new List<string>();
            for(int i =0; i<inputText.Count; i++)
            {
                string result =GetData(inputText[i]);
                switch (result)
                {
                    case "lower": lowerCase.Add(inputText[i]); break;
                    case "upper": upperCase.Add(inputText[i]); break;
                    case "mixed": mixedCase.Add(inputText[i]); break;
                }
            }
            Console.WriteLine("Lower-case: {0}",string.Join(", ", lowerCase));
            Console.WriteLine("Mixed-case: {0}",string.Join(", ", mixedCase));
            Console.WriteLine("Upper-case: {0}", string.Join(", ", upperCase));
        }

        private static string GetData(string element)
        {
           string typeIs = string.Empty;
           if (element[0]>='a' && element[0] <= 'z') typeIs="lower";
           else if (element[0]>='A' && element[0] <= 'Z') typeIs="upper";
           else typeIs="mixed";
           for (int i=1; i<element.Length; i++)
               {
                   if (element[i] >= 'a' && element[i] <= 'z'
                       && typeIs == "lower") typeIs = "lower";
                   else if (element[i] >= 'A' && element[i] <= 'Z'
                       && typeIs == "upper") typeIs = "upper";
                   else
                   {
                       typeIs = "mixed";
                       break;
                   }
                }
           return typeIs;
        }
    }
}