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#include <bits/stdc++.h>
using namespace std;

const int N = 3e5 + 5;

int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	
	long long ile = 0;
	
	string s;
	cin >> s;
	
	for(int i = 0; i < s.length(); i++){
		long long a = 0;
		long long b = 0;
		long long c = 0;
		
		for(int j = i; j < s.length(); j++){
			if(s[j] == 'a') a++;
			else if(s[j] == 'b') b++;
			else c++;
			
			if((a == b && b == c) || (a == 0 && b == c) || (b == 0 && a == c) || (c == 0 && a == b) || (a == 0 && b == 0)
			|| (a == 0 && c == 0) || (b == 0 && c == 0)) ile++;
			
		}
	}
	
	cout << ile << "\n";
}