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

namespace _01SerializeString
{
    public class SerializeString
    {
        public static void Main()
        {
            var inputString = Console.ReadLine();

            var outputChars = new Dictionary<char, List<int>>();

            for (int i = 0; i < inputString.Length; i++)
            {
                if (!outputChars.ContainsKey(inputString[i]))
                {
                    outputChars[inputString[i]] = new List<int>();
                }
                outputChars[inputString[i]].Add(i);

            }

            foreach (var character in outputChars)
            {
                Console.WriteLine($"{character.Key}:" + string.Join("/", character.Value));
            }
        }
    }
}