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#include <iostream>
#include <string>
using namespace std;
int a[300005] {};
int b[300005] {};
int c[300005] {};
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);

string s;
bool xa=0,xb=0,xc=0;
int x=0,maxi=0,la=0,lb=0,lc=0;
long long int ile=0;

cin>>s;

for (int i=1;i<=s.size();i++)
{
a[i]=a[i-1]+a[i];
b[i]=b[i-1]+b[i];
c[i]=c[i-1]+c[i];

if (s[i-1]=='a')
{a[i]++;}
else if (s[i-1]=='b')
{b[i]++;}
else if (s[i-1]=='c')
{c[i]++;}
}


if ((a[s.size()]==s.size()) || (b[s.size()]==s.size()) || (c[s.size()]==s.size()))
{cout<<((s.size())*(s.size()+1))/2;
return 0;}

ile=ile+(s.size()*2)-1;

for (int i=0;i<=s.size()-3;i++)
{
x=3;
while (i+x<=s.size())
{
la=a[i+x]-a[i];
lb=b[i+x]-b[i];
lc=c[i+x]-c[i];
xa=la;
xb=lb;
xc=lc;
maxi=max(la,lb);
maxi=max(maxi,lc);

if ( (la==maxi*xa) && (lb==maxi*xb) && (lc==maxi*xc) )
{ile++;
x=x+xa+xb+xc;}
else
{x=maxi*(xa+xb+xc);}
}
}

cout<<ile;

return 0;
}