#include "bits/stdc++.h"
#ifndef err
#define err(...)
#define DebugWriteLine(...)
#endif
using namespace std;
void Calc();
#define ALL(win) begin(win),end(win)
#define RALL(win) (win).rbegin(),(win).rend()
typedef int64_t ll;
typedef uint64_t ull;
int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed << setprecision(15);
  cin.exceptions(istream::failbit | istream::badbit);
  Calc();
  cout.flush();
  return 0;
}
template<class T> struct Iter {
  T&operator++() { return ++i; }
  constexpr const T&operator*() const { return i; }
  constexpr bool operator!=(const Iter &o) const { return i != o.i; }
  T i;
};

struct Scanner {
  template<class A = string>static A Next() { A a; cin >> a; return a; }
  template<class A = int>static vector<A> Array(int n) { vector<A> a(n); for (A&i : a) cin >> i; return a; }
  static string Line() { string s; getline(cin, s); return s; }
  static int Int() { return Next<int>(); }
  template<class A>Scanner&operator,(A&a) { a = Next<A>(); return *this; }
  template<class A>operator A() { return Next<A>(); }
}in;

/*---------------------------------------------------------------------*/

struct Char {
  Char() { c.reserve(6); }
  std::vector<char> c;
};
void Calc() {
  Char a;
  a.c.push_back(0xe2);
  a.c.push_back(0x80);
  a.c.push_back(0xa6);
  int maxi = 0;
  int cnt = 0;
  string s = in;

  Char c;
  for (int i = 0; i < s.size(); ) {
    c.c.clear();
    bitset<8> b(s[i]);
    c.c.push_back(s[i++]);
    if (b[7] == 0) {
      continue;
    }
    for (int j = 6; b[j]; j--) {
      c.c.push_back(s[i++]);
    }
    if (c.c == a.c) maxi = max(++cnt, maxi);
    else cnt = 0;
  }

  cout << maxi << endl;
}