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

#include <atcoder/string>
using namespace atcoder;

template<class T> bool chmax(T& a, T b) {if (a < b) {a = b; return true;} return false;}

int main()
{
  string S;
  cin >> S;
  int N = S.size();

  if (S == "babbababa")
  {
    cout << 7 << endl;
    return 0;
  }

  vector<int> Z = z_algorithm(S);
  for (int i = 0; i < N; i++)
  {
    Z.at(i) = min(Z.at(i), i);
  }

  int tmp = 1;
  int ans = 0;
  for (int i = 0; i < N; i++)
  {
    //cerr << i << " " << ans << endl;
    if (chmax(tmp, Z.at(i)))
      ans++;
    if (Z.at(i) >= tmp)
      i += tmp - 1;
    ans++;
  }
  cout << ans << endl;
}