#include <bits/stdc++.h>
using namespace std;
int main(){
  string S;
  cin >> S;
  string T = "yukicoder";
  int N = S.size();
  int mx = 0;
  int c = 0;
  for (int i = 0; i < N; i++){
    if (S[i] == T[c % 9]){
      c++;
      mx = max(mx, c / 9);
    } else {
      c = 0;
    }
  }
  cout << mx << endl;
}