#include <iostream>
using namespace std;

string yuki = "yukicoder";

int main()
{
    string s;
    cin >> s;
    int n = s.size();
    int ans = 0;
    int c = 0;
    for (int i = 0; i < n - yuki.size() + 1; i++)
    {
        if (s.substr(i, (int)yuki.size()) == yuki)
        {
            c++;
            i += yuki.size() - 1;
        }
        else
        {
            c = 0;
        }
        ans = max(ans, c);
    }
    cout << ans << endl;
}