#include <bits/stdc++.h>
#include<iostream>
#include<map>
#include<vector>
#include <algorithm>
#include<math.h>
#include <iomanip>
#include<set>
#include <numeric>
#include<string>
using ll = long long;
using namespace std;


int main()
{
    string s, yuki = "yukicoder";
    cin >> s;
    int n, i = 0, cnt = 0, max1 = 0;
    n = s.size();
    while (n){
        if (s.substr(i, 9) == yuki){
            cnt++;
            i += 9;
            n -= 9;
            max1 = max(max1, cnt);
        } else {
            cnt = 0;
            i++;
            n--;
        }
    }
    cout << max1 << endl;
}