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#include <cstdio>
#include <cstring>
int a,b,c,buf;
char word[300005];
int main(){
    scanf("%s",&word);
    int dlg = strlen(word);
    int all = 0;
    for(int i=0 ;i<dlg; i++){
        a=b=c=0;
        for(int j=i; j<dlg; j++){
            //buf=all;
            if(word[j]=='a')
                a++;
            if(word[j]=='b')
                b++;
            if(word[j]=='c')
                c++;
            if(a==0 && b==0 || b==0 && c==0 || a==0 && c==0){
                all++;
            } else {
                if(a==0) {
                    if(b == c)
                        all++;
                } else if(b==0) {
                    if(a == c)
                        all++;
                } else if(c==0) {
                    if(a == b)
                        all++;
                } else {
                    if( a == b && a == c)
                        all++;
                }
            }
        /*
            if(buf!=all){
                for(int a=i; a<=j; a++)
                    printf("%c",word[a]);
                printf("\n");
            }
        */
        }
    }
    printf("%d",all);
    return 0;
}