using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        //Input: "aaaabbbcca"

       //Output:[("a", 4), ("b", 3), ("c", 2), ("a", 1)]

        string str="aaaabbbccccaaa";

        var temp="";

        int count=0;

        for(int i=0; i<str.Length;i++){

            if(temp.Equals(str[i].ToString())){

                count=count+1;

            }else {

                if(count!=0){

                    Console.WriteLine($"({temp},{count})");

                }

                count=1;

                temp=str[i].ToString();

            }           

        }

        Console.WriteLine($"({temp},{count})");

        Console.WriteLine($"({2/3},{2/3})");

    }

}