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//Mateusz Piórkowski
#include <iostream>
#include <string>
bool is_balanced(int64_t* freq){
	int64_t target_freq = 0;
	for(int i=0; i<3; i++){
		if(freq[i]){
			if(target_freq==0) target_freq = freq[i];
			else if(target_freq!=freq[i]) return 0;
		}
	}
	return 1;
}

int main(){
	std::ios_base::sync_with_stdio(false);
	std::cin.tie(NULL);

	std::string slowo;
	std::cin >> slowo;
	int64_t output=0;
	int64_t freq[3];

	for(int i=0; i<slowo.size(); i++){ //Check all substrings
		freq[0]=0;
		freq[1]=0;
		freq[2]=0;
		for(int j=i; j<slowo.size(); j++){
			freq[slowo[j]-'a']++;
			if(is_balanced(freq)){
				output+=1;
			}
		}
	}
	std::cout << output << "\n";
}