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

int main()
{
    string S;
    cin >> S;
    int N = S.size();
    string yuki = "yukicoder";
    int yuki_N = yuki.size();
    vector<int> vec_yuki;
    for (int i = 0; i < N - (yuki_N - 1); i++)
    {
        if (S.substr(i, yuki_N) == yuki)
        {
            vec_yuki.push_back(i);
        }
    }
    int vec_yuki_N = vec_yuki.size();
    int tmp = 1;
    int ans = 0;
    for (int i = 0; i < vec_yuki_N - 1; i++)
    {
        if (vec_yuki[i] + 9 == vec_yuki[i + 1])
        {
            tmp++;
        }
        else
        {
            if (tmp > 0)
            {
                ans = max(ans, tmp);
                tmp = 1;
            }
        }
    }
    if (vec_yuki_N)
    {
        ans = max(ans, tmp);
    }
    cout << ans;
}