#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define reps(i, a, n) for(ll i = (a); i < (ll)(n); ++i)
#define rep(i,n) reps(i,0,n)
#define all(a) (a).begin(), (a).end();
//なんかstd::vector<bool>の挙動を修正できるやつ

/* alias */
using ull = unsigned long long;
using ll = long long;
using vi = vector<int>;
using vl = vector<long>;
using vll = vector<long long>;
using vvi = vector<vi>;
using vvl = vector<vl>;
using vvll = vector<vll>;
using vs = vector<string>;
using pii = pair<int, int>;
template<>
struct std::vector<bool>: std::basic_string<bool> {
    using std::basic_string<bool>::basic_string, std::basic_string<bool>::operator =;
    explicit vector(size_t n): vector(n, false) {}
};

int main(){
    string s;
    cin >> s;
    string t = "yukicoder";
    bool flag = false;
    int cnt = 0;
    int tmp = 0, ans = 0;
    rep(i,s.length()){
        if(s.substr(i,9) == t){
            cnt++;
            if(s.length() - i < 9){
                break;
            }
            i += 8;
        }else cnt = 0;
        ans = max(ans, cnt);
    }
    cout << ans << endl;
    return 0;   
}