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

namespace SpaceEscape
{
    class Program
    {
        static void Main(string[] args)
        {
            string target = Console.ReadLine();
            Console.WriteLine(checkAnagram(target));
        }

        static int checkAnagram(string str)
        {
            int max_count = 0; // max count for anagram word
            for (int i = 0; i < str.Length; i++)
            {
                int count = 0; // count for anagram word
                for (int j = 1; j < str.Length; j++)
                {
                    if (i + j >= str.Length || i - j < 0)
                        break;

                    if (str[i + j] == str[i - j])
                        count++;
                }

                if (max_count < count)
                    max_count = count;


            }

            return max_count * 2 + 1;

        }
    }
}