#include<bits/stdc++.h>
using namespace std;
ifstream fin("palm.in");
ofstream fout("palm.out");
int nr,sol,i,n,j;
char s[510];

int main()
{
    fin>>s;
    n=strlen(s);
    for(i=0;i<n;i++)
    {
        nr=1;
        for(j=1;i-j>=0&&i+j<=n;j++)
            if(s[i-j]==s[i+j]&&s[i-j]<=s[i-j+1]) nr+=2;
            else break;
        sol=max(sol,nr);
    }
    for(i=0;i<n-1;i++) if(s[i]==s[i+1])
    {
        nr=2;
        for(j=1;i-j>=0&&i+j+1<=n;j++)
            if(s[i-j]==s[i+j+1]&&s[i-j]<=s[i-j+1]) nr+=2;
            else break;
        sol=max(sol,nr);
    }
    fout<<sol;
    return 0;
}