#include <stdio.h>
#include <string.h>
char sir[510];
int l, i, p, max;
int main()
{
	freopen("palm.in", "r", stdin);
	freopen("palm.out", "w", stdout);
	scanf("%s", sir);
	l=strlen(sir);
	max=1;
	for (i=0; i<l; i++)
	{
		p=1;
		while (((i-p)>=0)&&((i+p)<l)&&(sir[i-p]==sir[i+p])&&(sir[i-p]<=sir[i-p+1]))
			p++;
		if (p>max)
			max=p;
	}//for i
	max=(max-1)*2+1;
	printf("%d\n", max);
	return 0;
}//main