#include <iostream>
using namespace std;
int main(void){
    string s;
    cin >> s;
    int count = 0, mxc = 0;
    for (int i = 0; i < (int)s.size(); i++) {
        if (s.substr(i, 9) == "yukicoder") {
            count++;
            i += 8;
        }
        else {
            mxc = max(mxc, count);
            count = 0;
        }
    }
    mxc = max(mxc, count);
    cout << mxc << endl;
}