DigitsLettersAndOther

using System;
using System.Text;

namespace DigitsLettersAndOther
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            string text = Console.ReadLine();
            StringBuilder sbForDigits = new StringBuilder();
            StringBuilder sbForLetters = new StringBuilder();
            StringBuilder sbForOthers = new StringBuilder();
            foreach (var symbol in text)
            {
                if (char.IsDigit(symbol))
                {
                    sbForDigits.Append(symbol);
                }

                else if (char.IsLetter(symbol))
                {
                    sbForLetters.Append(symbol);
                }

                else
                {
                    sbForOthers.Append(symbol);
                }
            }

            Console.WriteLine(sbForDigits);
            Console.WriteLine(sbForLetters);
            Console.WriteLine(sbForOthers);
        }
    }
}