Count Symbols

using System;

class Program
{
    static void Main(string[] args)
    {
        string words = Console.ReadLine();
        char[] arr = words.ToCharArray(); Array.Sort(arr);
        int counter = 0;
        for (int i = 0; i < arr.Length - 1; i++)
        {
            counter++;
            if (arr[i] != arr[i + 1])
            {
                Console.WriteLine("{0}: {1} time/s", arr[i], counter);
                counter = 0;
            }

            if (i == arr.Length - 2)
            {
                Console.WriteLine("{0}: {1} time/s", arr[i + 1], ++counter);
            }
        }
    }
}