01DataTypeFinder without 4. & .4 is string

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

namespace _01DataTypeFinder
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();

            string dataType = "";
            int countSymbol = 0;
            int countPoint = 0;
            int countMinus = 0;
            int countOther = 0;
            char charSymbol = ' ';
            int beforePoint = 0;
            int afterPoint = 0;

            while (input != "END")
            {
                foreach (var item in input)
                {
                    if (Char.IsDigit(item) == true)
                    {
                        int position = (int)Char.GetNumericValue(item);
                        countSymbol++;
                        if (charSymbol == ' ' || charSymbol == '-' && countPoint == 0)
                        {
                            beforePoint++;
                        }
                        else if (charSymbol == '.')
                        {
                            afterPoint++;
                        }
                        if (input.Length == countSymbol && countOther == 0 && countPoint == 0 && countMinus <= 1)
                        {
                            dataType = "integer";
                            break;
                        }
                    }
                    else
                    {
                        countSymbol++;
                        charSymbol = item;
                        if (charSymbol == '.')
                        {
                            countPoint++;
                        }
                        else if (charSymbol == '-')
                        {
                            if (afterPoint >= 1)
                            {
                                countMinus++;
                            }
                            countMinus++;
                        }
                        else
                        {
                            countOther++;
                        }
                        if (input.Length == countSymbol && countPoint == 1 && input.Length > 1)
                        {
                            if (beforePoint > 0 && afterPoint > 0 && countMinus <= 1)
                            {
                                dataType = "floating point";
                            }
                            else
                            {
                                dataType = "string";
                            }
                        }
                        else if (input.Length == 1 && Char.IsDigit(item) != true)
                        {
                            dataType = "character";
                        }
                        else if (input == "true" || input == "false")
                        {
                            dataType = "boolean";
                        }
                        else if (input.Length > 1 && input.Length == countSymbol)
                        {
                            dataType = "string";
                        }
                    }
                    beforePoint = 0;
                    afterPoint = 0;
                    charSymbol = ' ';
                    countPoint = 0;
                    countMinus = 0;
                    countOther = 0;
                    countSymbol = 0;
                    Console.WriteLine($"{input} is {dataType} type");
                    input = Console.ReadLine();
                }
            }
        }
    }
}