#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;

string S;
int pos = 0, cnt = 0, ans = 0;

int main() {
  cin >> S;
  while (pos < S.size()) {
    if (S.substr(pos, 9) == "yukicoder") {
      cnt++;
      pos += 9;
    } else {
      ans = max(ans, cnt);
      cnt = 0;
      pos += 1;
    }
  }
  ans = max(ans, cnt);
  cout << ans << endl;
  return 0;
}