#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef unsigned long long int ull;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll myRand(ll B) {
    return (ull)rng() % B;
}
inline double time() {
    return static_cast<long double>(chrono::duration_cast<chrono::nanoseconds>(chrono::steady_clock::now().time_since_epoch()).count()) * 1e-9;
}

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    string s; cin >> s;
    string t = "yukicoder";
    int res = 0;
    int cnt = 0;
    for (int i = 0; i < s.size(); ++i) {
        if (s.substr(i, t.size()) == t) {
            cnt++;
            res = max(res, cnt);
            i += t.size()-1;
        }
        else {
            cnt = 0;
        }
    }
    cout << res << endl;
}