A7,8

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

namespace GerryTutor
{
    class Program
    {

        static List<double> Union(List<double> a, List<double> b)
        {
            List<double> result = new List<double>();
            foreach (var item in a)
            {
                if (!result.Contains(item))
                {
                    result.Add(item);
                }
            }
            foreach (var item in b)
            {
                if (!result.Contains(item))
                {
                    result.Add(item);
                }
            }
            return result;
        }
        static List<int> NonRepeat(int[] arr)
        {
            HashSet<int> set = new HashSet<int>();
            foreach (var item in arr)
            {
                set.Add(item);
            }
            return set.ToList();
        }
        static void Main(string[] args)
        {
            Dictionary<char, int> d = new Dictionary<char, int>();
            string text = Console.ReadLine();

            foreach (var ch in text)
            {
                if (!d.ContainsKey(ch))
                {
                    d.Add(ch, 1);
                }
                else
                {
                    d[ch]++;
                }
            }

            foreach (var item in d)
            {
                Console.WriteLine($"{item.Key} -> {item.Value}");
            }
        }
    }
}