#include<fstream>
#include<string>
using namespace std;
ifstream f("palm.in");
ofstream g("palm.out");
char c[501];
int i,x[501],a[501],m,n,j,st,dr;
int main()
{
	f>>c;
	n=strlen(c);
	for(i=1;i<=n;i++)
	{
		a[i]=1;
		x[i]=int(c[i-1])-96;
	}
	for(i=2;i<=n-1;i++)
	{
		st=i-1;
		dr=i+1;
		if(x[st]==x[dr]) 
		{
			a[i]+=2;
			while(x[st-1]==x[dr+1] && x[st-1]<=x[st] && st-1>0 && dr+1<=n)
			{
				st--;
				dr++;
				a[i]+=2;
			}
		}			
	}
	int maxx=a[1];
	for(i=1;i<=n;i++) if(a[i]>maxx) maxx=a[i];
	g<<maxx;
	f.close();
	g.close();
	return 0;
}