#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
  #define _GLIBCXX_DEBUG
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  string s;
  cin >> s;
  int ans = 0, tmp = 0;
  rep(i, s.size() - 9 + 1) {
    if (s.substr(i, 9) == "yukicoder") {
      tmp++;
      ans = max(ans, tmp);
      i += 8;
    }
    else {
      tmp = 0;
    }
  }
  cout << ans << endl;
  return 0;
}