using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

​

namespace Strings_and_Text_Processing___More_Exercises

{

    class Program

    {

        static void Main(string[] args)

        {

            var symbols = new List<char>();

            string text = Console.ReadLine();

​

            foreach (var letter in text.Distinct().ToArray())

            {

                Console.Write($"{letter}:");

                int index = text.IndexOf(letter);

                while (index != -1)

                {

                    Console.Write($"{index}");

                    index = text.IndexOf(letter, index + 1);

​

                    if (index != -1)

                    {

                        Console.Write("/");

                    }

                }

​

                Console.WriteLine();

            }

​

​

            //var foundIndexes = new List<int>(); // list of indexs of our characters 

            //for (int i = 0; i < text.Length; i++)

            //{

            //    symbols.Add(text[i]);

            //    foundIndexes.Add(i);

            //}

            //Console.Write(string.Join("/", foundIndexes));

​

        }

    }

}