#include<bits/stdc++.h>
using namespace std;
string s;
long long ans;
int main(){
cin>>s;
int len=s.size();
for(int i=0;i<len;i++){
char alpha=s[i];
int l=i;
while(s[l-1]!=s[i]&&l>0) l--;
int r=i;
while(s[r+1]!=s[i]&&r<len-1) r++;
ans+=(long long)1+(i-l)+(r-i)+(long long)(i-l)*(r-i);
}
cout<<ans;
return 0;
}