#include <bits/stdc++.h>

using namespace std;

class point {
  double x;
  double y;
public:
  point(double x, double y) {
    this->x = x;
    this->y = y;
  }

  point() {
    this->x = 0;
    this->y = 0;
  }
  
  point operator+(const point &p) const {
    return point(x + p.x, y + p.y);
  }

  point operator-(const point &p) const {
    return point(x - p.x, y - p.y);
  }

  bool operator<(const point &p) const {
    if (this->x != p.x)
      return this->x < p.x;
    return this->y < p.y;
  }
};

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  string s;
  cin >> s;

  tuple<point, point, point> cur(point(0, 0.5), point(0, 0), point(1, 0));
  set<tuple<point, point, point> > t;
  t.insert(cur);
  
  for (char c: s) {
    point A, B, C;
    tie(A, B, C) = cur;
    if (c == 'a')
      A = B + C - A;
    else if (c == 'b')
      B = C + A - B;
    else
      C = A + B - C;

    cur = tuple(A, B, C);
    t.insert(cur);
  }
  
  cout << t.size() << endl;
  
  return 0;
}