//Normal-2

#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

void p(auto a){
  cout << a;
}

void ps(auto a){
  cout << a << " ";
}

void ps(){
  cout << " ";
}

void pl(auto a){
  cout << a << endl;
}

void pl(){
  cout << endl;
}

void fix15(){
  cout << fixed << setprecision(15);
}

void YES(){
  pl("YES");
}

void NO(){
  pl("NO");
}

void Yes(){
  pl("Yes");
}

void No(){
  pl("No");
}

void yes(){
  pl("yes");
}

void no(){
  pl("no");
}

//Normal-2
int main(){
  string S; cin >> S;

  int f = (int)S.find("yukicoder");
  while(f != -1){
    S.replace(f, 9, "#");

    f = (int)S.find("yukicoder");
  }

  int ans = 0, chain = 0;
  for(int i = 0; i < (int)S.size(); i++){
    if(S[i] != '#'){
      ans = max(ans, chain);

      chain = 0;
    }else{
      chain++;
    }
  }

  pl(max(ans, chain));
}