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

bool chmax(int& a,int b){if(a<b){a=b; return 1;} return 0;}

int main(){

    string s;
    cin >> s;
    int sz = s.size();

    string yuki = "yukicoder";

    int cnt = 0;
    int now = 0;
    int ans = 0;

    for(int i=0;i<sz;i++) {
        if(s[i] == yuki[now]) now++;
        else {
            cnt = 0;
            now = 0;
        }
        
        if(now==(int)yuki.size()) {
            now=0;
            cnt++;
        }

        chmax(ans,cnt);
    }
    cout << ans << endl;

    return 0;
}