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#include <bits/stdc++.h>

using namespace std;

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    string slow;
    cin>>slow;
    int ilc,ilb,ila;
    long long il=0;
    for(int i=0;i<slow.size();i++){
            ilc=0;ilb=0;ila=0;
        for(int j=i;j<slow.size();j++){
            if(slow[j]=='a'){
                ila++;
            }
            else if(slow[j]=='b'){
                ilb++;
            }
            else if(slow[j]=='c'){
                ilc++;
            }
            if(ilc==ilb and ilb==ila){
                il++;
            }
            else if(ilc==0 and ilb==0){
                il++;
            }
            else if(ilb==0 and ila==0){
                il++;
            }
            else if(ila==0 and ilc==0){
                il++;
            }
            else if(ila==0 and ilb==ilc){
                il++;
            }
            else if(ilb==0 and ila==ilc){
                il++;
            }
            else if(ilc==0 and ila == ilb){
                il++;
            }
        }
    }
    cout<<il<<"\n";
}