#include <bits/stdc++.h>
using namespace std;
#define FOR(i,m,n) for(int i=(m);i<(n);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
using ll = long long;
constexpr int INF = 0x3f3f3f3f;
constexpr long long LINF = 0x3f3f3f3f3f3f3f3fLL;
constexpr double EPS = 1e-8;
constexpr int MOD = 998244353;
// constexpr int MOD = 1000000007;
constexpr int DY4[]{1, 0, -1, 0}, DX4[]{0, -1, 0, 1};
constexpr int DY8[]{1, 1, 0, -1, -1, -1, 0, 1};
constexpr int DX8[]{0, -1, -1, -1, 0, 1, 1, 1};
template <typename T, typename U>
inline bool chmax(T& a, U b) { return a < b ? (a = b, true) : false; }
template <typename T, typename U>
inline bool chmin(T& a, U b) { return a > b ? (a = b, true) : false; }
struct IOSetup {
  IOSetup() {
    std::cin.tie(nullptr);
    std::ios_base::sync_with_stdio(false);
    std::cout << fixed << setprecision(20);
  }
} iosetup;

template <typename T = char, typename U>
std::vector<std::pair<T, int>> run_length_encoding(const U& s) {
  const int n = s.size();
  std::vector<std::pair<T, int>> res;
  if (n == 0) [[unlikely]] return res;
  T ch = s.front();
  int num = 1;
  for (int i = 1; i < n; ++i) {
    if (s[i] != ch) {
      res.emplace_back(ch, num);
      num = 0;
    }
    ch = s[i];
    ++num;
  }
  res.emplace_back(ch, num);
  return res;
}

int main() {
  const string yukicoder = "yukicoder";
  string s; cin >> s;
  const int n = s.length();
  string t = "";
  for (int i = 0; i < n;) {
    if (i + yukicoder.length() <= n && s.substr(i, yukicoder.length()) == yukicoder) {
      t += '*';
      i += yukicoder.length();
    } else {
      t += s[i];
      ++i;
    }
  }
  int ans = 0;
  for (const auto& [ch, len] : run_length_encoding(t)) {
    if (ch == '*') chmax(ans, len);
  }
  cout << ans << '\n';
  return 0;
}