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#include <iostream>
#include <vector>
#include <string>
#include <cstring>

using namespace std;

int main() {
	string s;
	cin >> s;
	int n = 0;
	for(int i = 0; i < s.length(); i++){
		int a = 0;
		int b = 0;
		int c = 0;
		for(int j = i; j < s.length(); j++){
			if(s[j] == 'a') a++;
			if(s[j] == 'b') b++;
			if(s[j] == 'c') c++;
			if( (a==b || a==0 || b == 0) && (a==c || c == 0 || a == 0) && (c == b || b == 0 || c == 0) ) n ++;
		}
	}
	cout << n << endl;
	return 0;
}