using static System.Math;
using System;

public class Hello
{
    static void Main()
    {
        var s = Console.ReadLine().Trim();
        getAns(s);
    }
    static void getAns(string s)
    {
        var s2 = s.Replace("yukicoder", "@");
        var n = s2.Length;
        var ans = 0;
        var c = 0;
        foreach (var x in s2)
        {
            if (x == '@') c++;
            else { ans = Max(ans, c); c = 0; }
        }
        ans = Max(ans, c);
        Console.WriteLine(ans);
    }
}