#include <bits/stdc++.h>
using namespace std;
#define  ma 1000000007
#define ll long long int
#define io ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);

int main() {
	io
	string S;
    cin >> S ;
    string P="yukicoder";


    int n = S.length(), m = P.length();
    int ans = 0;

    for (int i = 0; i <= n-m; i++) {
        bool ok = true;
        for (int j = 0; j < m; j++) {
            if (S[i+j] != P[j]) {
                ok = false;
                break;
            }
        }
        if (ok) {
            int cnt = 1;
            for (int j = i+m; j <= n-m; j += m) {
                bool ok2 = true;
                for (int k = 0; k < m; k++) {
                    if (S[j+k] != P[k]) {
                        ok2 = false;
                        break;
                    }
                }
                if (ok2) {
                    cnt++;
                } else {
                    break;
                }
            }
            ans = max(ans, cnt);
        }
    }

    cout << ans << endl;
	return 0;
}