//#pragma GCC target("avx2")
//#pragma GCC optimize("O3")
//#pragma GCC optimize("unroll-loops")
#include <iostream>
#include <iomanip>
#include <algorithm>
#include <vector>
#include <string>
#include <set>
#include <map>
#include <cassert>
#include <cmath>
#include <tuple>
#include <queue>
#include <bitset>
using namespace std;
using lg = long long;
#define TEST clog << "TEST" << endl
#define IINF 2147483647
#define LLINF 9223372036854775807LL
//#define AMARI 1000000007
#define AMARI 998244353
#define TEMOTO ((sizeof(long double) == 16) ? false : true)
#define TIME_LIMIT 1980 * (TEMOTO ? 1 : 1000)
#define el '\n'
#define El '\n'

#define MULTI_TEST_CASE false
void solve(void) {
    string s;
    cin >> s;
    string yuk = "yukicoder";
    int ans = 0, temp = 0;
    for (int i = 0; i < s.size(); i++) {
        if (yuk[temp % 9] == s[i])temp++;
        else {
            //clog << temp << el;
            ans = max(ans, temp / 9);
            temp = 0;
        }
    }
    ans = max(ans, temp / 9);
    cout << ans << el;
    return;
}

void calc(void) {
    return;
}

int main(void) {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int t = 1;
    if (MULTI_TEST_CASE)cin >> t;
    while (t--) {
        solve();
    }
    //calc();
    return 0;
}