using System;

public class Program

{

    public static void Main()

    {var pi = "3.141592653589793238462643383279502884197169399375105820974944592307816406286".ToCharArray();

        var lenCounts = new int[16];

        for(int i = 1; i < pi.Length-1; i++){

            if(pi[i+1] == pi[i-1]){ //center of an odd length pal

                int n = 2; 

                while(pi[i+n] == pi[i-n] && n < lenCounts.Length) n++;

                lenCounts[((n-1)*2+1)]++;

                Console.WriteLine(new string(pi[(i-n+1)..(i+n)]));

            } else if(pi[i] == pi[i-1]){ //center of an even length pal

                int n = 1;

                while(pi[i+n] == pi[i-1-n] && n < lenCounts.Length) n++;

                lenCounts[n*2]++;

                Console.WriteLine(new string(pi[(i-n)..(i+n)]));

            } 

        }

        lenCounts.Dump();

        Console.WriteLine("Hello World");

    }

}