using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace Palindrom
{
    class Program
    {
        public static int sude = 0;
        public static int a = 0;
        public static int e = 0;
        public static int b;
        public static string s;
        public static int x = 0;
        public static double vysledek1;
        public static double vysledek2 = 0;
        public static char[] zadani;

        static void Main(string[] args)
        {
            var radky = File.ReadAllLines("vstup.txt");
            s = radky[0];
            b = s.Length - 1;
            zadani = s.ToCharArray();
            for (; e < s.Length - 1; e++ )
            {
                vysledek1 = 0;
                palindrom();
                if (vysledek1 >= vysledek2)
                {
                    vysledek2 = vysledek1;
                }
                a = e;
            }
            string zkouska = (vysledek2 / 2).ToString();
            Int32.TryParse(zkouska, out sude);
            if(sude == 0)
            {
                Console.WriteLine(vysledek2 * 2 + 1);
            }
            else
            {
                Console.WriteLine(vysledek2 * 2);
            }
            Console.ReadLine();
        }

        public static void palindrom()
        {
            for(; a < b; a++)
            {
                for (b = s.Length - 1; b > a; b--)
                {
                    if (zadani[a] == zadani[b])
                    {
                        vysledek1++;
                        a++;
                        x = s.Length - 1 - b;
                    }
                }
                b = s.Length - 1 - x;
            }
        }
    }
}