using namespace std;

#include <iostream>
#include <fstream>
#include <climits>

int main(){
	char s[505];
	ifstream fin("palm.in");
	ofstream fout("palm.out");
	int LMax=0;
	fin >> s;
	for(int i=0;s[i];++i){
		int j,k;
		//cazul impar
		if(i>=0 && s[i+1]){
			j=i-1,k=i+1;
			while(s[j]==s[k] && j>=0 && s[k] && s[j]<=s[j+1])
				j--, k++;
			j++, k--;
			if(k-j+1>LMax)
				LMax = k - j +1;
		}
		//cazul impar()
		if(s[i+1] && s[i]==s[i+1]){
			j=i-1,k=i+2;
			while(s[j]==s[k] && j>=0 && s[k] && s[j]<=s[j+1])
				j--, k++;
			j++, k--;
			if(k-j+1>LMax)
				LMax = k - j +1;
		}
	}
	fout<< LMax << "\n";
}