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

typedef long long ll;
typedef long double ld;
typedef pair<int, int> Pii;
typedef pair<int, ll> Pil;
typedef pair<ll, ll> Pll;
typedef pair<ll, int> Pli;
typedef vector<vector<ll>> Mat;
#define fi first
#define se second
const ll MOD = 1e9 + 7;
const ll MOD2 = 998244353;
const ll MOD3 = 1812447359;
const ll INF = 1ll << 62;
const double PI = 2 * asin(1);
void yes() { printf("yes\n"); }
void no() { printf("no\n"); }
void Yes() { printf("Yes\n"); }
void No() { printf("No\n"); }
void YES() { printf("YES\n"); }
void NO() { printf("NO\n"); }

string s;
const string t = "yukicoder";
int ans = 0, now = 0, cnt = 0;

int main() {
  cin >> s;
  for (int i = 0; i < s.length(); i++) {
    if (s[i] == t[cnt]) {
      cnt++;
      if (cnt == t.length()) {
        cnt = 0;
        now++;
        ans = max(ans, now);
      }
    } else {
      cnt = 0;
      now = 0;
      if (s[i] == t[cnt]) {
        cnt++;
      }
    }
  }

  cout << ans << endl;

  return 0;
}