#include <iostream>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <fstream>
#include <cmath>
#define MAX 1000010
using namespace std;
ifstream fin("savemzx.in");
ofstream fout("savemzx.out");
char str[MAX];
long long p[MAX];
int n; 
/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char** argv) 
{
	fin>>str+1;
	n=strlen(str+1);
	p[1]=1;
	for(long long i=2;i<=n;i++)
	{
		if(str[i]!=str[1])
			p[i]=i*i;
		else
		{
			long long temp=1;
			while(str[i]==str[temp]&&i<=n)
			{
				p[i]=(i-temp)*(i-temp)+p[temp];
				temp++,i++;
			}
		}
	}
	sort(p+1,p+1+n);
	fout<<p[n]+p[n-1]<<endl;
	return 0;
}