#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include<bits/stdc++.h>
#include<atcoder/all>
using namespace std;
using namespace atcoder;
using ll=long long;

void IO(){
  ios::sync_with_stdio(false);
  std::cin.tie(nullptr);
}

int main(){
  IO();
  string s;
  cin>>s;
  ll ns=s.size();
  ll ans=0;
  for(ll i=0;i<ns;i++){
    if(s[i]=='y'){
      ll tmp=0;
      ll idx=0;
      for(ll j=i;j<ns;j++){
        if(idx==0){
          if(s[j]=='y'){
            idx=(idx+1)%9;
          }else{
            i=j;
            break;
          }
        }else if(idx==1){
          if(s[j]=='u'){
            idx=(idx+1)%9;
          }else{
            i=j;
            break;
          }
        }else if(idx==2){
          if(s[j]=='k'){
            idx=(idx+1)%9;
          }else{
            i=j;
            break;
          }
        }else if(idx==3){
          if(s[j]=='i'){
            idx=(idx+1)%9;
          }else{
            i=j;
            break;
          }
        }else if(idx==4){
          if(s[j]=='c'){
            idx=(idx+1)%9;
          }else{
            i=j;
            break;
          }
        }else if(idx==5){
          if(s[j]=='o'){
            idx=(idx+1)%9;
          }else{
            i=j;
            break;
          }
        }else if(idx==6){
          if(s[j]=='d'){
            idx=(idx+1)%9;
          }else{
            i=j;
            break;
          }
        }else if(idx==7){
          if(s[j]=='e'){
            idx=(idx+1)%9;
          }else{
            i=j;
            break;
          }
        }else if(idx==8){
          if(s[j]=='r'){
            idx=(idx+1)%9;
            tmp++;
          }else{
            i=j;
            break;
          }
        }
      }
      ans=max(tmp,ans);
    }
  }
  cout<<ans<<endl;
}