using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;
class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var s = ReadLine();
        var ans = 0;
        var tmp = 0;
        for (var i = 0; i < s.Length; ++i)
        {
            if (IsYuki(i, s))
            {
                ++tmp;
                i += yuki.Length - 1;
            }
            else tmp = 0;
            ans = Math.Max(ans, tmp);
        }
        WriteLine(ans);
    }
    static string yuki = "yukicoder";
    static bool IsYuki(int pos, string s)
    {
        if (pos + yuki.Length > s.Length) return false;
        for (var i = 0; i < yuki.Length; ++i)
        {
            if (yuki[i] != s[pos + i]) return false;
        }
        return true;
    }
}